my car will miss or spudder when i ask too much from it in lower rpms. it did it a lot more when regular gas got accidentally put into it ,less with premium but it's still there.anyone have this problem before and can point me in the right direction? thanks

 

Need all the details on ''my car'' before anyone could possibly guess at what it's doing.

 

sorry, i also posted in a ls1 specific forum as well and gotten mixed up. my car is a 1999 z-28 6-sp ls1 . iv'e been advised to change plugs and wires and it should clean it up. i was wondering how to test coils and when they need to be replaced. thanks guys.. can't wait til spring to drive my baby again.

 

Bad 02 sensors will cause the car to spudder also.