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Car hesiates and stumbles anywhere between 2k and 4k RPM

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Old 08-24-06, 06:46 PM
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Car hesiates and stumbles anywhere between 2k and 4k RPM

Alright here is my dilemma, anywhere under part or full throttle between 2 and 4K the car will hesitate and sometimes backfire, YET, the minute I make it to roughly 4k RPM, the car smooths out and is fine all the way to redline. It seems like a fuel delivery issue. TPS possibly?
Old 08-24-06, 07:07 PM
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Forgot to mention, this is only when in boost, part throttle vacuum is fine.
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