2007 5.7 Hemi in 73 Plymouth Duster (pedal cuts out)

Hello,

I recently put a 2007 Chrysler Aspen 5.7 Hemi in my 73 Plymouth Duster, with a Durango 545 RFE transmission (4x4 but running it as RWD only), 8 3/4 rear end. It has the Digital instrument cluster outta the Aspen, and a fly by wire pedal.
Ive had an issue for months that I cant seem to
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