Engine Performance problem
2001 Pontiac Grand Prix 6 cyl Front Wheel Drive Automatic
Fixed the MAF Sensor, cleaned the EGR, changed spark plugs and wires. The car runs fine. Problem is when you accelerate to pass another car the motor starts trembling and looses power as if it were choking. I know its not the limiter, there is no exact RPM for the misfire or what ever is happening. When put in a fast acceleration it chokes and trembles, gains power and looses it again in different intervals. If you dont push it hard it runs fine. Has no check engine light on. Im tired of " repairing" different things and the car remains the same. Could it be the ECM, PCM, Supercharger or something else?