A little history:
Car is a 2001 Pontiac Grand Prix with 58,000 miles. Majority of miles were put on with 200 and 500 mile round trips on weekends. Car had been running great, with only major maintenance being a tie rod end from a pot hole and the valve cover gasket replacement under warranty. Noticed a slight odor of antifreeze coming from one of the two cars. Eventually saw a tell tale puff of steam from under the hood of the Grand Prix. Took it into local mechanic who is usually pretty good. He replaced the intake manifold gasket. Upon receiving the car back, was running great until I took it on a longer trip. On the way back, the Boost indicator would come on when I was decelerating. Car was also acting a little erratic. Took it to the mechanic who did not find anything. THe next trip left me stranded at the side of the road. Car stalled and would not restart. Mechanic towed it back and said a vacuum hose had collapsed. Next incident was a fast idle. It has been in the shop 7 times for either stalling and not restarting, boost light comming on when decelerating, very fast idle (3000 RPM). Also has rough shifts. So far, Mass Air Sensor, Throttle Position Sensor and Oxygen sensor have been replaced. I am able to reproduce this behavior on demand after picking up the car, however, dealership and local mechanic always hand me the keys and say they have fixed the problem. Dealership now wants to replace the computer. They say that they swapped in a computer from a used car on the lot. I really do not think it is the computer. I think the mechanic missed something when he did the intake manifold. Any thoughts on what it might be?
Originally Posted by SuperSport
so i stay away from my local dealership. 
