pete,been reading your thread and had the same prob with customer car several months ago.it wound up being a separate computer/relay on the floor in front of pass feet.i had assumed that main f.i. computer operated the idle but not the case.i went to salvage yard and found the part and fixed the problem.[this client had gone to expense of changing out the electronic accelerator with no effect]

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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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