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my sisters wj keeps throwing a p0123 code for a low voltage tps code. i have replaced the tps, cleaned the throttle body, and replaced both front o2s. i searched google a bit and found the head bolt melting thru the wiring harness problem. fixed the wires and still having probs. she said it reved up to 2000 rpm on start up this morning and shudders sometimes. any help would be appreciated.
