Hello.
I have a 78 Dodge truck with a 2010 LX 5.7 hemi swapped in. Throttle body came with the engine but not the pedal. I'm using one from a Ram I believe. Had originally bought the pedal from a scrapper. I'm getting a miss or rough idle sometimes but definitely under part throttle miss or running rough. Occasionally I get a General Miss (P0300?) but not always. Just started doing this recently. Also replaced the used cam and crank sensors with new ones. Had used coils on it, but now SOS coils, no change. Plugs look perfect. WOT runs great.
I thought it might be the throttle body or pedal (still drive by wire) so I ran a check with the engine off and it appears that the output from the pedal is very inconsistent (up and down even with a steady press of the right foot) and doesn't go all the way to 100% as seen in the attached log. I thought it was a bad pedal and ordered a new one. Threw it in and I'm getting the same output. Did a relearn with both pedals. I did a similar check on the TPS by manually actuating the throttle blade and it produced a smooth curve in VCM Scanner.
Any guesses as to what is going on here? Attached my current tune too.
schriner 78 dodge truck 09 jeep gc 5.7L 6.4 WOT Demand 5-16-21.hpt
Throttle pedal.hpl