Having problems with your 2004 Pontiac Grand Prix ?
My 2004 Grand Prix vibrates between 50-70 miles an hour when you accelerate or under load. If you let off the gas the vibration in the steering wheel stops. I have had it scoped, tuned up, injectors flushed, but still the same.
My o4 is doing the same thing. It all started after I changed my tire six from 215 to 225's. I think is the threading though that causes these issues. Do you have new or used tires?
Check d tires..some tires wid uneven cut causes cars to vibrate under high speed
Repair Help & Product Troubleshooting for 2004 Pontiac Grand Prix
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