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The tachometer in my 2009 DTS stops working. After a short drive and usually at first stop (red light) and idle my 09 DTS idles rough, tach stops car may stall,

then runs rough in restricted mode and NO "check engine light".

Any ideas on where to look?

Thank you Roger

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Only happens on first drive when cold?  Intermittent connection in the richness circuitry for idle perhaps?  Or throttle body needs cleaning and idle position re-learn?


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