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I don't actually think the throttle position sensors are varying their output, rather the ecu/ computer is reinterpriting what that output means. Some of the newer chevy sensors have multiple potentiometers built in for redundancy, so the ecu is comparing those results and "deciding" the result.
Thus you would want to monitor the ecu output if possible. Not exactly sure on 95, my experience is with TBI (approx 94 back) and gmt800 (approx 99+).
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