Tire size on stock changed before Gryphon

[Longshot270]

Originally Posted by dginter

well, truck died n just got towed of the expressway
i was getting on the expressway and accelerating and right bout 50 mph n lost all power, she dropped to about 800 rpm's, no response when pushing the accelerator pedal... pulled off the side and she was runnin' very rough like on 2 cylinders or somethin and shakin' a bit...
turned her off n now won't start.
you all think it could be something w/ the programmer? had it on level 2
did notice a lil extra tickin noise this morning but would go away w/ a rise on rpm's
placed it back to stock
hooked up to a snap on 2500 computer and shows no codes, says fuel pressure is 40 psi, removed plug and she has spark, the injector flashed
any ideas? i'm at a loss

Doesn't sound like the tune based on what happened. Too bad you didn't hook it up to the computer before reflashing back to stock. That wipes the memory.

The drop to 800 RPM while going 50 is strange. Limp home mode would have dropped it into 3rd gear if I'm not mistaken. Doing so would have kept the RPMs pretty high.

Have you checked all the fluid levels?