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11-26-2004, 09:58 AM
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Rat Killer
Join Date: Aug 2002
Location: Cold ass Ohio
Posts: 1,143
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Re: 5.0 idles up and down when warm
Start with testing the IAC like Pkrwd said. Most of the time a good cleaning with some GOOD carb cleaner fixes them up. If that isn't it, head to the O2 sensors. Just for the record, for some unkown reason, I've had bad luck with aftermarket O2 sensors. It costs a bit more, but I always put Ford O2 sensors back in.
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d-Con Racing "Nothing fancy, just 347 inches of RAT POISON!" MICE need not apply..... 
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