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Did you check the sensors? Or just attempt to reset the PCM??? If its not throwing a CEL light/code, then resetting the PCM won't do you any good.
Edit on that one, you said you checked the sensors.
Check the IAC valve, and the TPS wiring harness.....sometimes they act retarded, since they're shorter and tighter than they should be (i.e. MPSC's TPS Repair wire)