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Without codes, and the symptoms of your issues, I'm not sure what to look at. Sounds like it could be a stuck egr valve. Have you deleted it? If not, cleaned it lately? Can the sctunes be hiding the true codes? I say this because an out of sync cam sensor with the crank sensor could only mean one or the other sensor is intermittent, which should throw a code. If someone with experience with SCtuners has experienced anything like this, they may be able give some you some advice.
2001 F-250 X-Tra Cab 7.3 Turbodiesel Lariat-8ft. Bed
6 spd. Manual Trans, Superchips, Mag-Hytec diff cover.
2003 6.0 Turbodiesel Excursion LTD
Last edited by Dweezil; 12-09-2013 at 11:41 PM.
Reason: Sentence clarity.