Pontiac Problems? Ask a Mechanic for Answers ASAP
good afternoon my name is ***** ***** I will assist
1. it could be a bad injector leaking fuel into a cylinder causing lower pressure and the smoking
2. could be the injector pump itself. I did lots of work on these back in the day and the injector pumps were a real problem.
no, it would not be the vacuum pump. it merely supplies vacuum for the accessories to run in the car.