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Q: slipping transmission on 2000 Pontiac Bonneville

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At highway speeds around 50 to 70 mph my car has a surge almost like the transmission is slipping. it's hard to explain but it's like a redundent rrr rrrr rrr rrr rrr rrr and then it stops but it can do ti again at any time. You can actually feel the car slow down and then speed up again over and over.

thanks Keith
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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It does sound like a transmission or drivetrain problem which sounds like something that will soon fail. If it does turn out to be something simple at least it should be easy to diagnose as you can duplicate the problem for the mechanic consistently.
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