I took the IROC to a friends shop and put it on the scanner because it had a slight detonation, it was running lean all the time. We did the obvious and changed the o2 sensor. Well, now it is starting hard and it stumbles like it wants to cut off when you first put it in drive right after it cuts on. After you get in second gear, its fine, and it won't stumble again, even if you stop at a light. It's also started to backfire when it is reving down. WTF is wrong with my baby???!!! I think it might be something with the TPS. It is still detonating.

 

ttt

 

If it's STILL "detonating" why don't you grab a timing light, get your happy *** under the hood and check the timing ? Possibly retard it until it stops pinging ? Sound reasonable to me!

 

Ouch!!!!!!!!!!!!!

 

I agree it's advanced, but, geese isen't that allitle harsh?

 

lmao off blackened...but yeah try messing with your timing.

 

LB, always runing lean? May want to look for a vacuum leak as well.