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My vehicle doesn't accelerate when the vehicle reaches speeds of 40 mp to 55 mp. Tachometer indicates increase in rpm, but the vehicle doesn't increase in speed.
This could be a transmission, plugged exhaust or an issue with the fuel/ignition system. Better get it looked at for a diagnosis, here are some shops in your area: http://repairpal.com/directory?address=20020&car_brand_names=Pontiac