Ford Focus Forum, Ford Focus ST Forum - View Single Post - ZX5 engine stumble when stopped, help!
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Old 11-16-2011, 11:59 AM   #11
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Join Date: Nov 2011
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Location: Houston, TX
What I Drive: 2002 gunmetal gray zx3/2007 zx3 ses

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Any high mileage Focus owner should clean around the butterfly in the throttle body.Oil from the crankcase vent and the pcv system causes a sticky residue to form which causes the low idle, hard starting problem
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