Discussion Starter · #1 ·
I have a 2007 Pontiac Grand Prix Base. The vehicle just recently started stuttering while going up hill or when the engine is under a decent load. I figured out that it isn't a coil pack. When I use a obd2 scanner it reads p0171 and p0303, the car does also have 2 other codes, that being p0446(replaced gas cap and evap purge valve and still appears) along with p2430. The car doesn't appear to misfire when idle.