1994 Pontiac Grand Am Repair Question
Asked on October 13, 2007
1994 Grand Am Gt 3.1 Running Rough
Hi, I have a 1994 Grand Am Gt with a 3.1 and 215,000 miles. The car has always run pretty well until recently, when it started to idle rough. The whole car shakes when at a light or sitting in park. If it is warmed up, it doesn't shake so bad when in neutral. It is louder than it ever was too. The sound does not seem to be exhaust either, especially since I just had that replaced about a year ago. Also, the noise seems to pulse as I accelerate. Within the last year, I have replaced the fuel filter, the spark plugs and wires, the water pump, the radiator, and the heater core. Any help would be greatly appreciated. It feels like a completely different car when I drive it and I can't stand it.
Replied on October 21, 2007
I'd look for vacuum leaks/vacuum hoses that popped off etc, but you may want to check the MAP sensor. Unplug the electrical connector when it is running. If nothing changes, it may be bad. On my vehicle, I unplugged it and it stalled the vehicle.