LT1-LT4 Modifications 1993-97 Gen II Small Block V8

need help, car not running right

Thread Tools
 
Search this Thread
 
Old Mar 30, 2005 | 02:19 PM
  #1  
MA1384's Avatar
Thread Starter
On The Tree
 
Joined: Oct 2003
Posts: 195
Likes: 0
From: Upstate NY
Default need help, car not running right

It all started right before I put the car away. I ordered a tune and loaded it on just before it went off the road and when I drove it around it would severly missfire, spitting and sputtering if i give it any more throttle than just the weight of my foot. So when I got home i loaded the stock tune back on and put it in the garage.

Now, last week it got pretty nice out so i decided to take it out for a spin. It started a little hard because the battery was a little dead, which i expected and let it run for a little while to warm it up. I drove it around for a little while without beating on it because it had been stored for over 4 months. Then when I gave it a little gas it would run ok untill about 3500ish rpms and it would misfire again, not as bad as when it had the tune, but still really bad complete loss of power. Also everytime the engine would go back down to idle after being under a load it would go down below 500rpms and shake like it was ganna stall and then catch itself, it would do that a couple times then idle fine untill I put it under a load again. Revving the engine in in neutral seemed fine as well.

After that I chaged my egr valve cause it was sticking a little and that did nothing. Resetting the pcm and loading the stock tune on again didnt do anything either. Would this be somthing wrong with the computer? It never did anything like this before I loaded the tune on. Im awaiting an e-mail from where i got the tune from, but I'd like to get some imput from you guys too. Thanks in advance and sorry about the lenth.
Reply
Old Mar 30, 2005 | 03:19 PM
  #2  
Jordan57's Avatar
TECH Enthusiast
 
Joined: May 2004
Posts: 549
Likes: 0
From: St. Peters, MO
Default

Does this happen every time it goes under a load? Is it an auto or m6? If auto is it having problems downshifting? Any codes? What codes were deleted if any? Those questions aside...this happened when my opti crapped out on me. I would be driving along normally and the just give it some gas and the thing would sputter and missfire and almost die then be okay for a bit...then happen again...I got a new opti from jason cromer and all was gravy.
Reply
Old Apr 1, 2005 | 04:12 PM
  #3  
MA1384's Avatar
Thread Starter
On The Tree
 
Joined: Oct 2003
Posts: 195
Likes: 0
From: Upstate NY
Default

Originally Posted by Jordan57
Does this happen every time it goes under a load? Is it an auto or m6? If auto is it having problems downshifting? Any codes? What codes were deleted if any? Those questions aside...this happened when my opti crapped out on me. I would be driving along normally and the just give it some gas and the thing would sputter and missfire and almost die then be okay for a bit...then happen again...I got a new opti from jason cromer and all was gravy.

Its an M6, it does happened everytime its under a load but nothing before 3500ish rpms, runs fine before that. It does try and stall when going down to idle after a load whether I bring it that high or not. There arent any codesthat i know of. If it is the opti, is there any way I can make sure without having to buy one first? Thanks for the help.
Reply




All times are GMT -5. The time now is 06:45 PM.

story-0
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-1
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-2
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-3
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-4
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-5
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-6
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-7
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-8
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-9
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE