Mercedes Benz repair: white smoke, plug holes, air mixture

Question
560sel mb 151000 miles     after idling for 10 min car gets sluggish and no electrical control check eng lite etc white smoke exhaust   after mkt repair says compression check ok   flushed radiator changed therm etc two diff mech says eleectronic test shows no trouble  

Answer
your gas/air mixture may need to be adjusted you are running too rich or your distributor fuel may be shot pull plugs and check the plug holes for gas have someone crank over and see if you are getting a spray mist from your plug holes remeber to unplug your distributor coil