Thread: '98 C280 Rough Idle
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Old 12-19-2004, 04:56 PM
suginami suginami is offline
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Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,538
I'd change the spark plugs and the coil supressor boots.

Use only the OEM Bosch non-resistor type spark plug.

98% of all rough idle problems on M104 engines are caused by these coil supressor boots.
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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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