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I vote for idle stabilization valve. Had to replace mine a few months ago. Idle speed was too high when warm and too low when cold. Unfortunately, valve costs about 150 bucks.
You should hear a click from TPS just as throttle closes. Like IanS said above, that could also be the problem.
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Lawrence
1986 951
2002 SLK32 AMG
1987 328GTS
2011 528i
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