What tuner is on the truck? If it's custom tuning I'd look at the PID data for the main duration. If the duration drops below like 200-high 100s it doesn't fire the injectors. Pretty much the ECM saying that it's useless to fire at that low of a duration. Had it happen on my truck when messing around with different tuning files. Bumped up the duration a little bit and the lope at idle stopped.
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06 2wd QCSB, Forced Inductions 476/96/1.10, DDP Super Mentals 250%, dual cp3s, Hamilton springs, manton pushrods, 625s, fass 150/sump, built trans by me, tcs billet shafts, dpc triple disk, Muldoons hpvb, fleece fuel distro block, mm3 by Gordon
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