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Q: When its cold out the car doesnt want to idle. We have to keep revving at stops. on 2001 BMW 330i

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I think its taking on air but from where and how much does it cost to fix?
Have the CHECK ENGINE light DIAGNOSED. Don't put parts on because of a code. Have the cause of the code determined. Possibly faulty coolant temp sensor or problem in that CIRCUIT (wiring , connection(s) or low coolant) , or several other possibilities.Parts places SELL PARTS they don't diagnose---just my opinion...Good luck.
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