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It might be running too lean at idle, one thing you could do to check it is to remove the air cleaner top cover, and VERY SLIGHTLY press down on the air plate, say 1/16th to 1/8th of an inch, and see if the idle smooths out. If it does, it is running too lean. If it is, it might be possible to adjust the idle with the idle adjust screw, just to the rear of the air plate - 3mm hex wrench, if memory serves, turn ccw to richen, but only 1/8 turn at a time. If it won't richen with the idle adjust screw you most likely have a defective warm up regulator, a squarish looking aluminum unit just in front of the air cleaner close to the upper radiator hose. It has two smallish metal fuel lines on the top of it as well as a connector.
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Richard Wooldridge
'01 ML320
'82 300D 4.3L V6/T700R4 conversion
'82 380SL, '86 560SL engine/trans. installed
'79 450SL, digital servo update
'75 280C
Last edited by Richard Wooldridge; 03-28-2006 at 10:54 AM.
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