Just a thought, but how old is your coil? Is it original? It almost sounds like the symptoms of a bad coil- hardly supplies enough juice at idle and when warm, is very low.
Haasman
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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)
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