2005 Grand Prix: On a cold start my engine will start strong and loud. Warm start: it starts off with a weak idle and often dies immediately if i don't give it a pinch of gas ( i use 'pinch' because it doesn't take much, just a tap).
Use 89 ethanol blend. Seem to get a stronger start when i use some kind of octane booster/injector cleaner. but every mechanic I've talked to says I shouldn't need to do that.
One theory that has been brought up is because of the exhaust system changes i made. Took off the resonator and turned it into a cat back dual exhaust made the sensor (???? forgot which one) go haywire because of the exhaust pressure difference(?) (not mechanically inclined, so i don't remember the full details of the conversation).
Was hoping someone here might have any ideas on why it happens or if the theory above is right.
Use 89 ethanol blend. Seem to get a stronger start when i use some kind of octane booster/injector cleaner. but every mechanic I've talked to says I shouldn't need to do that.
One theory that has been brought up is because of the exhaust system changes i made. Took off the resonator and turned it into a cat back dual exhaust made the sensor (???? forgot which one) go haywire because of the exhaust pressure difference(?) (not mechanically inclined, so i don't remember the full details of the conversation).
Was hoping someone here might have any ideas on why it happens or if the theory above is right.
