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1998 4l80e Intermittent Shift Problem


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My 1998 K2500 has had 3 instances so far where the tranny shifted strange. It upshifts at a certain point (early), regardless of engine load, and won`t downshift. the check engine light came on one of these times, perhaps coincidently, but not the other two. I checked for codes and TPS was one that showed up. Could a bad TPS mess with shift points yet not set the check engine light on?

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