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Have you tried going to a Pontiac Dealership yet to have them look at it? When I was having problems with my trans, they told me there was an update for the computer, that would stop the "gear slippage" that i was encountering. That may be the case for your car.... especially since the mechanic claims that the car runs fine after clearing any codes. Unfortunetly for my car the update was not the issue, but my Catalytic Converter was clogged causing all my problems. Maybe this will help you out a little.
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