Diesel Bombers

I have a 2012 6.7 cummins, 120k miles. Everything is deleted, 2nd manifold w/ 67mm turbo, head studs, dynamite 90hp injectors. Mini max w/ custom tunes for fuel and air upgrades. Thuren suspension 3". 35" tires on method 18". Amp power steps, morimoto HIDs. I think that is it. Recently had AC quit working. Discovered it was the evaporater, changed it out and installed the fresh air filter. Fixed the problem for a week. Then it was a leak on the crimp on the l.p. line. Fixed that. Good for a week and headed out of town to okc and made it a mile from town and the picked shuttered/ jerked pretty aggressively and lost all power, engine, dash everything momentarily. Then it was all back. Had check engine and traction control lights come on. Code thrown was P0884 TCM power input signal intermittent. Any advice.