Alright,


So I've narrowed down this anomaly.

When I went to start the car early this morning, it idled at 750, revving itself between 700 and 800 rhythmically.

I drove it and came back, and it idled at 950 at idle when I parked.

So much for riding on the correct idle speed...


But then I drove out again, and didn't start the car for exactly 1 hour and 20 minutes. It idled to 550, and stayed there. No issues, no roughness. Perfect.


It's never done this before; I'm gonna keep at it and see if I can make any headway.



-Carlen

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1987 560SEL (210,000 miles)