Yes, I have replaced the throttle microswitch and have pulled the IAC valve and checked it's operation - and it seemed to be working correctly. I cleaned it out with the carb cleaner and put it back on - and the hoses are not leaking. Although, as I was checking things recently, I noticed that unplugging the IAC did not affect the idle...

Thanks!
ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE