why does my sunfire shake and flooding and not getting her right amount of power pick-up
Does the vehicle have the Service Engine light on? I would try to get the code read if so. It could be something like a bad Mass Air Flow sensor, which would put a bad reading of air coming into the engine, causing the computer to change the amount of fuel. That is just an out-on-a-limb guess with what information was stated in the question.
Search Pontiac Sunfire Questions
Pontiac Sunfire Experts