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You may also try replacing the TPS with a pair of resistors; measure the resistance between +5v and signal, and between ground and signal, and pick up some resistors in that ballpark. Then just stick them on the wires. If your signal is stable, you have a TPS issue. If it's still wonky, then shut the engine off. If it's -still- wonky, it's your wiring or the circuit in the ECU. If it stabilizes with the engine off, it's likely interference.
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