95 Z28 Engine Misfire
95 Z28 Engine Misfire I have a 95 Z28 that seems to be having a terrible misfire. It happens horribly when the car warms up. It's smooth till you try to floor it from about 40 mph then it stumbles and shakes until you let off the gas. Sometimes it will keep stumbling after you let up. Also, it has a horrible backfire. My mechanic seems to think there is a performance cam in it, (I am unsure of the history on the car, but it runs rich too). I think it might need tuning, I just wanted to get some opinions from some of you guys before I do.
I have a 95 Z28 that seems to be having a terrible misfire. It happens horribly when the car warms up. It's smooth till you try to floor it from about 40 mph then it stumbles and shakes until you let off the gas. Sometimes it will keep stumbling after you let up. Also, it has a horrible backfire. My mechanic seems to think there is a performance cam in it, (I am unsure of the history on the car, but it runs rich too). I think it might need tuning, I just wanted to get some opinions from some of you guys before I do.
Are you plug wires arcing on anything at all? Like exhaust mani/headers(depending on what you have) or maybe a heat sheild? Make sure all plug wires are tight and away from those sorts of things. Start it up and look under the hood at the wires and see if you see any flashing/spark.
i vote for WIRES cause they are cheaper to replace....easier to inspect too.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever
Verdad Gallardo Horrible backfire may be from a timing issue. But do remember Most LT1's are prone to backfiring, its just a thing they do. Mine never did it, i would say maybe 50% do. Im sure others will chime in on that.
another idaho person! lol back on subject
On The Tree
Joined: Jun 2004
Posts: 117
Likes: 0
From: Albuquerque, NM
Mine acted like this with a bad O2 sensor, but it also threw an O2 sensor code, so it may be worth checking! The thing that sounds exactly like mine is it ran ok until you tried to give it some gas, then it would sputter and try to die.
, an update on the thread at all? 
