2000 Silverado P0300 P0131

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2000 Chevy Silverado getting codes P0300, P0301, and p0131.

 

I’m getting these codes on my 2000 Silverado 1500 series truck with 5.3 motor also this is a 2 wheel drive.

 

Truck has no power on acceleration.

 

Cylinders 1, 3, 5, 7 are fouled out.

 

Truck has 140,000 miles

 

Every now and then I get p0301 code

 

I’m always getting code p0300

 

In now getting code p0131 after replacing the o2 sesor on bank 1 position 1

 

What have I done?

 

Changed all plugs

 

Changed wires

 

Replaced intake manifold gasket

 

Independently changed out every coil pack one at a time with a new coil.

 

Replaced fuel filter.

 

Replaced fuel pump 10,000 miles ago

 

All spark plugs where also changed 10,000 miles ago with E3 plugs

 

Rerplaced all 8 fuel injectors with bone yard injectors.

 

I ohm out all the injectors cold and there was no variances and I also ohm them all out hot with a slightly higher reading with no dramatic variances .

 

Replaced fuel regulator

 

I went to the Chevy dealer and they told me that the upper o2 was bad on driver’s side and the catalytic converter may also be bad on driver’s side. I had a muffler shop cut the cat out and inspected it. Cat was visually fine with no blockage or rattling.

 

All of this has cost me 305.00 with my own labor. I’m worried about taking this back to the dealer. I don’t care to take this to an average mechanic as to this is probable over the average corner mechanics head.

 

I would greatly appreciate any further advice.