I agree that there is some cause for really rough idle on these cars. I found that two plug wires were on the wrong cylinder when I bought the car; probably a mechanic who crossed hands. It ran basically fine, but had a more than normal idle roughness. Sometimes it is just something basic like that; fuel or air or vacuum related. As others have said in this thread, perform basic maintenance in those areas and see what the cure is. Also, take it to a GOOD mechanic who can check it out and also add some good injector cleaner; that kind of thing...... Ben Carter

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Ben Harrison Carter
1999 Mercedes ML320 87K
1992 Mercedes 300CE 89K
1995 Corvette 29K -- Sold Dec 09
1989 Mercedes 420SEL 99K -- (Sold 4/08)
1968 Mercedes 230S (106K) (Sold 9/06))
1976 Mercedes 450SEL 130K (Just sold - 06)
1961 Mercedes 220Sb (sold years ago)