Have read many posts on here about this and have not found one yet that anyone has said they found there problem and what it was... but heres mine.
Car- 02 grand prix gtp
K&n open filter no resonator borla mufflers i bought the car like this ran great for coulpe weeks..
I have now ran into this stuttering prob.. replaced plugs and fuel filter no clue what else to do...
I ran the car hard tonight and the ses started flashing so i plug my code reader in and had misfire cylinder 1. but the light didnt stay on..
The Plugs that came out looked fine so dont think i have an internal prob.
NEED HELP..