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I had a 96 with a similar issue. I tried rotating the ICS valve to create a slower decel, but I finally scanned it and found a 1602 code. This was an alternator code (in this case). When this code occurs the ram in the ecu is cut off so the memory of the idle speed is lost. It is a two trip code so if the alternator does not spike in the next 2 cycles the code is gone and the memory of the idle is restored.
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