grrr troouble codes, P0300, P0101, P0137

Hey everyone, I have a 2003 H2, 143,000 miles, been running great, a week or so ago, it fell flat on its face, no power, hardly able to go over 20 mph or so. Check Engine flashing.

I have my own scanner and have been a mechanic for a long time.

Checked the codes

I was receiving P0300, Random Misfires,

P0137 Heated oxygen sensor (HO2S) 2, bank 1 -low voltage

P0101 Mass air flow (MAF) sensor/volume air flow (VAF) . sensor circuit malfunction

I am guessing that all the codes stem from a lean condition from the misfires.

So I replaced the Plugs, Wires and coils, and the MAF just for the heck of it,

Drove the truck, still receiving the P0300 code.

Checked the real time data with the truck running and almost all the cylinders are misfiring.

Wondering if anyone has the parameters for the fuel injectors when the car is running to check and see what the actual fuel injector data is.

not sure what the next step would be, not sure what the ECM considers a misfire, as its not giving me a actual numeric coil number with the codes, or is a misfire a ignition stroke with no combustion, like a plugged injector or a injector that's not spaying enough or too much.

Thanks

Sounds like a plugged cat


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