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To me, it sounds very much like a possible throttle switch failure. It lies underneath your fuel distributor/air flow assembly. Consists of a butterfly valve, throttle body, with an electric switch integrated as well.
Commonly reffered to as a TPS (Throttle Position Switch) on other cars. I know that on a 300E engine in good tune, unplugging the throttle switch will cause the idle to go up from 500 to 900rpms. If the switch fails in the WOT position, it will tell your ECU to fuel for WOT (Full Acceleration Enrichment), even at IDLE!
Good luck,
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