2001 Chevy Monte Carlo SS, 91k miles. Was getting hessitation on acceleration, noticable around 2200 and under load. Had an EGR code a while ago, change EGR vale and cleared code seemed better. Hessitation came back, seems worse, no codes at all. Changed plugs and fuel filter, test drove it. Seemed a little better, then on hard accelleration, it started to break up and pop, like a backfire possible? let off gas and then it settled down but sounded different. Looked under hood and the air injector valve was blown apart and melted (AC delco part XXX-XXXX) Will change this as it is destroyed. Question, what would cause this? A clogged catalitic converter? What is causing the hesitation? ANd why no trouble codes being set?
Optional Information:
2001
Chevrolet Monte Carlo SS 3.8L V6
Already Tried:
spark plugs, fuel filter EGR valve, air filter