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May be the throttle position sensor(TPS). I'mhaving the same trouble with mine. I kno in past cases, with different vehicles I've own, that when it revs high and stumbles or sputters it's usually the TPS. It's like $35 from Advance Auto.

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Q: Why does my cadillac catera 99 revs up but doesnt go then stumbles and kicks when driving more than 30 min?
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