You most likely have an engine vacuum leak causing the high idle speed.
Testimonial: "Thanks a million Yadayada, it was a vacuum leak at the EGR valve gasket... when I cleaned the EGR, I did not put new sealant on the gasket and it leaked causing too much NOX and high RPM, now it idles at 860, and NOX is way below average, passed CA inspection. Thanks a million, Yadayada, you are "The MAN!""
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Any ideas where the vacuum leak is most likely, hoses, gaskets, tubing? BTW, the EGR tube is cleaned out.
Glad to help. I guess those 25 years at a Ford dealer was a good thing!
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