poker22only
New member
car is backfiring at high rpm's when u really get on it. fuel filter has been replaced. i ran a can of sea foam in my car a week before this happened and looked online and read about it screwing up the spark plugs. however i pulled a spark plug off it today and it looked fine. so i am not sure if possibly the cats are clogged, possibly the optispark is going out? any other ideas much appreciated. 96 lt1 6 speed