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Message: [QUOTE="TARM, post: 662340, member: 578"] Have you physically checked the IPR valve yet? Sometimes that lock nut loosens or comes off completely and end up laying in the valley. When either of those happen your idle gets all kinds of choppy etc.. Another thing could the the Oil temp sensor maybe. Just a guess but not likely. When mine had idle issues it was the IPR nut was loose or had come off. The other was a ICP sensor issue even if the numbers look out. Sometimes they just get screwy. I am very leery of messing with used IPRs unless you know for sure they were running good when they came off. Usually when one stops running right cleaning or not rebuilding or not it never seems to work 100% reliable again. I know others may have had there's run fine. I end up only buying genuine Ford or IH parts for anything electronic on these engines. Way too much time troubleshooting mine and friends 7.3s only to find out it was caused by some china crap part from ebay or auto chain store. The price sucks as its about 3x fair market value but well worth the possible headache and peace of mind IMHO. [/QUOTE]

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