2002 chevy silverado 2500hd mass air flow sensor problems

Checking the codes again, we get these codes. If we let the engine cool down to ambient temperature and clear all the codes, it will run great for the first 5 minutes when started, then as soon as it warms up while driven, the Service Engine Light starts flashing again and power falls off.

Interestingly, all four plugs on the RH (Passenger Side) are getting fowled, while those on the LH (Driver Side) look fine. All the plugs appear to be getting a nice hot spark. All spark-plugs and plug wires were replaced TWICE. The Mass Air Flow Sensor and air filter were replaced. Leaving the shop, the truck ran great for about 5 minutes then the power fell right off, the SEL started flashing again, the engine started to misfire and it would not go over 20 MPH even with throttle floored. One of our local exhaust shops told my son that the Mass Air Flow Sensor was bad and both Cat Converters were plugged, and with much reluctance my son agreed for them to replace both converters and a new muffler to the tune of $889.00 because he needed to get it running ASAP since he is missing out on a lot of snowplow work. My son did say that the fuel gauge has not worked for a couple of months, but the truck ran fine until 3 weeks ago. P0463 - Fuel Level Sensor A Circuit - High Input P0461 - Fuel Level Sensor A Circuit Range/Performance P0332 - Knock Sensor 2 Circuit Low Input (Bank 2) P0300 - Random Multiple Misfires Detected P0154 - O2 Circuit No Activity Detected (Bank 2 Sensor 1) P0131 - O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)

2002 chevy silverado 2500hd mass air flow sensor problems