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two things: trans filter may be clogged up and as speed increases, it gets more starved of fluid. I'd say change tranny fluid even if its not the problem.
two: I still would suspect the catalytic converter. My friend's cavalier revved fine and would idle all day long with no issues but when in drive, under a load it was useless.
at this point, I say its a process of elimination. 1. change the transmission fluid and 2. cut out the cat and put in a test pipe and see what happens.
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2000 Chevrolet Malibu LS
2000 Oldsmobile Alero GL (sold)
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