Just wanted to update this. FINALLY got it fixed. After a new map adapter, new ecm adapter, new OEM Cummins MAP, new Quad wiring harness, Quadzilla sent me a new module to try, none of which worked. Almost gave up and then I started messing with grounds. Well, embarrassing enough, it was a bad passenger side ground. Just goes to show how finicky they can be. Still can’t wrap my head around why it only did it with only the Quad hooked up and not all the time. Must’ve been because the Quad had a good ground and the sensor did not? Also, I can’t thank Quadzilla Kelton enough for going out of his way to help me every way he could.