Hello everyone, I own a 2013 Chevy Silverado 2500 4x4 with the 6 litre flex-fuel motor with 155,000 miles. My check engine light started blinking, and my truck vegan running poorly. I put my code reader, and it came back as a bad 02 sensor. I replaced all four. I cleared the codes and took her for a drive. She ran great. For about 10 miles. I plugged in my code reader and it showed a code for baronetric pressure sensor. I changed that along with the MAP sensor. The engine then began backfiring through the airbox. The next code was for the Throttle Position Sensor. I changed it. Now, my truck won't even run. She will start and, during warmup, runs well. As soon as the idle gets down to 700 rpm she behaves like she is starving for fuel. Spitting and sputtering through the Airbox. I am at a loss for answers here. Does anyone have a suggestion as to what I should try next?