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Q: Rough idle on 2002 Ford Focus

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My car has a rough idle. Stopped at a red light or in a drive-thru, my car trembles, makes a blender noise, and a shaking sound comes on. What can this be? When i take it to the dealer, do i tell them what is happening or just tell them replace whatever you suggest?
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C.E.L. ON? HOSE GOING TO PCV VALVE GIVES A LOT OF TROUBLE ON THIS ENGINE. ALSO THE VALVE ITSELF.
BUT IF YOU GO TO A SHOP JUST ASK THEM TO CHECK IT OUT TELL THEM WHAT IT IS ACTING LIKE
NOT WHAT YOU THINK IS WRONG. DO NOT HAVE TO GO TO A DEALER FOR REPAIRS! BEST IF OEM PARTS
ARE INSTALLED(FORD PARTS FOR PCV SYSTEM). THE REPAIR SHOP CAN GET THESE PARTS.
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