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Q: 2006 BMW 525xi when at idle it pulsates around less than 1000 rpm on 2006 BMW 525xi

I have new crank thing. Also I have replaced all spark plugs and oxygen sensors. Replaced mass air flow sensors. it has to be something with air intake something small I'm thinking. Please help
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Try cleaning the IAC motor or valve. Be sure to check hoses connected to it for cracks and or dry rot. Here is the general procedure for your vechicle:
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