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Mine has had a rough idle three times on me.
First time: Incorrectly adjusted TPS after I had throttle body enlarged and I reassembled.
Second time: Bad distributor cap and/or rotor. This did not show up above idle speed.
Third time: Bad idle stablizer valve. Symptom occurred when first started and cold. It was fine when warm.
Vibration at idle: Bad engine mount. Vibration goes away above idle.
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Lawrence
1986 951
2002 SLK32 AMG
1987 328GTS
2011 528i
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