Might want to check to make sure you have proper spark plugs. ONLY Bosch F8DC4 or non plat non resister equivalent. The M104 uses a waste spark ignition system--anything other than non resistor non platinum spark plugs will almost certainly cause idle/run problems.

J. M. van Swaay

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1994 E320 Wagon, 230,000 miles
1995 E320 Sedan, 106,000 miles
1994 E500 Sedan, 79,000 miles