1985 Mercedes Benz 500sel engine misfire & stalling

1985 MERCEDES BENZ 500SEL
56,000 MILES • V8 • 2WD • AUTOMATIC
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GOD_SPEED
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hi my sel 500 has been misfiring at idle and always. after starting the engine it stalls after 1-2 mins at idle.

i have got all the spark plugs, spark plug cables, fuel pump, fuel filter checked but still problem persisits.

please advice.
Nov 10, 2010 at 7:05 AM
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TLTONY
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I have an 84 with the same problem. I found that I can assist the air valve opening when revving the engine. I'm trying to find out what activates the air valve because I think that's the root of the problem.
Feb 20, 2013 at 8:36 PM