Pontiac Repair: idle problems, mass air flow sensor, mass air flow

Question
I have a 97 pontiac grand prix gtp supercharge and it is having erractic idle problems. I have replaced my spark plugs, throddle position sensor and the mass air flow sensor. But nothing seems to stop the idle problem. I will be in park and it seems like my car is like a muscle car ha ha. Or while at a stop light it moves back and forth.

Answer
Hi jessica:
being that this is a super charged car, My "guess" would be it has a vacuum leak either between the intake and super charger in the front of the engine or the vacum line that feeds the map sensor in this is split open. that vacuum line is under the nose (front) of the super charger. goos luck.