17 silverado 4.3 with k&n cold air intake, cat back exhaust, and F5 superchips tuner tuned to 87octane tune with afm delete and 33" tires options only. The problem also happens when i change back to stock tune. Also has rebuilt tranny with new torque converter. 80kmi. Pipes and tuner and intake have been on for about 10k without issues.

Issue: First symptom is tpms light comes on, cannot read at least 1 tires pressure. Next, tpms light flashes. Then, CEL comes on and throws code p2635, and eventually p0188. I replaced the engine coolant temp sensor and put new battery in, cleared the codes and even went back to stock tune and still the same symptoms happen. The truck def is not running right, i can tell. Each time i disconnect battery and clear codes it runs fine for a few times before it doesnt. I really dont think its my fuel pump sensor i believe something is off with the computer and i dont feel like taking to dealer or shop to get bent over and replace the fuel pump sensor located under the bed and on top of fuel tank. If it means anything, i did notice i drove through big puddle after heavy rain storm before i noticed the CEL with those codes came on. Any suggestions are greatly appreciated!!!!! Thanks