A verity of thing's could cause shifting problems , besides TPS ! You best bet would be to have it hooked up to a scan tool that can read sensor data parameters . All engine an transmission sensors work off vehicle voltage or a steady reference voltage from the PCM /TCM . Usually 5 volts ! but can be 8 volts on some vehicles . A veteran tech can tell if a parameter is out of limits one way or another . Guessing never works out !
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A verity of thing's could cause shifting problems , besides TPS ! You best bet would be to have it hooked up to a scan tool that can read sensor data parameters . All engine an transmission sensors work off vehicle voltage or a steady reference voltage from the PCM /TCM . Usually 5 volts ! but can be 8 volts on some vehicles . A veteran tech can tell if a parameter is out of limits one way or another . Guessing never works out !