Engine Performance problem
1989 Mercedes Benz 300e 6 cyl Two Wheel Drive Automatic 233269 miles
Car will only start & run after I have thoroughly Cleaned Bosch Platinum +4 #4459 Spark Plugs.(Brand New) It will start right up but after idling, it will start missing quite soon and then will quit and refuse to start but will " try to start.&Quot; If I keep the revs high after cleaning plugs and starting, it will prolong how long it will stay running. After cleaning plugs and getting it to start, smoke is coming from the exhaust for a short period.
After stalling, The spark plugs are all uniformly covered in a dry black Soot that cleans right off. Air filter is brand new. I have been running it without during this problem. (I can make it around the block once.)