I would try checking the TPS readings, If the TPS isn't reading correctly/eratically the computer will get confused and cause it to hunt for idle. The easiest way to check it is to watch the graph in Halwin or alternatively use a multimeter on the Ohms setting and check against the signal wire. The readings should be ascending/descending depending on the TPS your using. If you have any part of the TPS that's very high resistance or Open circuit than its no good.
I hope this helps you out.
Aaron
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