I've read through all the threads I could find, but can't seem to find a definitive answer.
Here's the deal, at ~1,400-1,600 rpms, if I start easing down on the go pedal to speed up without downshifting, the truck has a horrible shudder. It's kind of like when a gas burner is getting too much fuel, and not enough air. It's bad enough that it SHAKES the entire truck. I have to back out of it, and hit the go pedal enough to downshift. Anything over ~1,900 rpms is completely normal. Any ideas? Changed the fuel filters, and made no difference.
SCT X3 (Looney Tuned), Coolant Filter, Zoodad Mod, BB Mod, EGR Delete, CCV Reroute, 220 AMP Alternator, 4" Turbo-Back Exhaust w/ Cat Delete, 4" ProComp, 35" MudGrapplers, Shell (color-matched), Winch Mount/Brushgaurd, Warn 15k Winch, Taillight Gaurds, TV/DVD w/ Game Console Hookup