I have a 1985 190E that is missing intermittently. When I say intermittently I mean it will run fine for a different amount of time before it misses. Sometimes it may be 5 times in a minute, sometimes 5 times in 25 seconds. It missed at idle as well as when you are driving. I have replaced plugs about 3,500kms ago. I also pulled off spark plug wires to see if problem got worse or stayed the same but did not make difference just ran worse. Any help would be appreciated.