01Cummins6spd

Ok I figured thats the next step but just makin sure there wasn't anything I'm not thinkin of

I'm new to the group and still learnin the Quadzilla as well (bought it in Jan of this year) so any help is appreciated. To give you a little history on my issue, I was towing 2 weeks ago and got a dead pedal intermittently then it quit for about a week then came back again. Had a P1689 code but no TPS. I cleaned all my grounds and battery cables along with TPS and VP plugs and then it ran smooth but with absolutely no power at all. I checked codes again and had a TPS code saying low voltage. We graphed the TPS and it was all good. Then ot through a code for the map sensor and that was only changing between 2 voltages so I unhooked the quadzilla and hooked the map up oem and it runs fine. The quad shows rpms yet but I lost tps. Also it doesnt change anything no matter what level its on. Any ideas on where or what to check next? Thanks in advance