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Kristy, not sure if this is way to late. but i had the same problem a couple years ago and just to save you thousands and thousands of dollars that i got screwed with. start by changing the ignition coils. doesn't make sense to me but that was the problem in the end and it took soo much money before they finally called pontiac hq and got them to diagnose the problemReport it
I have exact same problem. catalytic converter replaced twice under warranty and needs to be changed a 3rd time. changed oil religiously every 3000 miles but car burns oil internally - down a quart or more every 500 miles. i will try the ignition coil suggestion. thanksReport it