tacklebox

iTrader: (10)

My heads/cam have been on my car for about a week and a half now. After i put a few miles on the setup, it was idling smooth and felt nice under WOT and its been fine until yesterday... Now it has no power and stalls constantly, shakes at idle, and feels like its missing under acceleration. It ran fine for over a week... what did i mess up??

transamfreak01

iTrader: (8)

did u ever get it tuned??? even if you did id go back to the tuner

99FormulaM6

iTrader: (21)

check the o2s...

418redz28

iTrader: (10)

check the grounds on the back of the head on the driverside. mine did the same thing. hopefully one just came loose or sumthing. hope its an easy fix

tacklebox

iTrader: (10)

The car is untuned. But it wasn't doing this until yesterday. I was also thinking maybe the spark plugs? I checked all the wires and they are fine. Anything else?

tacklebox

iTrader: (10)

What are those ground straps for anyway?

jsteele90

iTrader: (13)

they keep the motor grounded. read a article in a super chevy mag one time. guys throttle cable in his 80s camaro kept locking or freezing up every few days turns out his grounds were off and all the currwnt running through the motor was going through his throttle cable instead of being grounded and welding his throttle cable together. crazy huh. make sure they are there

marv

iTrader: (40)

SES light on? Did you pull any codes?

My first thought was 02's...or possibly a ground as others mentioned.

I'd go back over it and check all the connections too.

1BADAIR

iTrader: (1)

if you were running wot without a tune you may have hurt the engine

THE CHOP SHOP

iTrader: (7)

Hopefully it is nothing internal but for safety sake what did the PTVC look like. It sounds like it is possible you could have slightly bent a valve but if you did that would be worst case scenario. If you know you were good on the clearance then I would spend more time hunting down the little things.

ChevyChad

iTrader: (50)

Check to see if any of the rocker bolts backed out...

tacklebox

iTrader: (10)

Positive my PTVC was fine. I scanned it and there are 4 codes:

p0140 - 02 sensor ckt no activity (bank 1 sensor 2)
p0160 - 02 sensor ckt no activity (bank 2 sensor 2)
p0300 - random/multiple cylinder misfire
p0405 - EGR flow sensor A circuit low input

I can explain the 02 sensor codes and the EGR code, because i havent had rear 02's or EGR for about a year, but the car has not had a problem. But i'm not sure about the cylinder misfire. Could my front 02's be going bad? Anyone have any suggestions?

Trev_SS

iTrader: (17)

you just need to get a tune sounds like nothing abnormal your car is just untuned mine is still untuned and i sometime have problems driving it.

rocksws6

iTrader: (4)

I don't think its the tune I think something is wrong. Driving untuned is not ideal but its not quite the horrible experience everybody makes it out to be. It still shouldn't miss and sputter. Tune or no tune.

tacklebox

iTrader: (10)

I just dont understand why it would be fine for 10 days after the install and then start acting up.

EastTnZ28

iTrader: (20)

My first guess would be 02's. If you have alot of miles it may bee a good time to change any way. Cheapest place I found my BOSCH sensors was Advanced Auto. Good luck. Probably something simple.

DaddySS

Check all your coonections, hoses, and plug wires (thoroughly). If they're OK, pull the plugs and see which cylinder is misfiring.

skibo

timing? i know thats exactly how some of my old cars ran when the timing was way off. good luck.

Viper

iTrader: (6)

If you still have your old rear O2's, swap them in for a quick check. Then you'll know if the existing ones are bad. Also a dirty MAF can cause that too. 2 quick $0 things to check.

NHRAFORMULA00

iTrader: (2)

Check your wires running to the 02 sensors.We had a problem like yours on my sons car, when he was having it tuned. Burnt harness, touched the headers.