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01 Sierra 5.3 Chugging


BearsBomber

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Hey guys, having some issues with my daily driver and could use some help since I'm running tight on funds. On Friday I ran codes on my truck, came back with O2 sensor(B1,S1) not working and a EGR code. So I found the sensor unplugged, so plugged that in, and cleaned my EGR valve, cleared codes. Saturday I went to drive around and found that if I try to accelerate with any hopes of going somewhere the truck would chug and would not go over 2500 rpms, but if I ease into like Oldtimer, it will gain speed smoothly but still bucks if I try to take it over 3k RPM. The SES light would only flash occasionally while driving but wouldn't stay on, finally yesterday it stayed on long enough for me to take it by Auto Zone and get the codes ran.

 

Here are the 10 codes it pulled, P0265, P0251, P0246, P0242, P0252, P0245, P0241, P0134, P0135, P0300.

 

I looked up all these codes and most of em are Turbocharger related, which I don't have, so I'm totally confused. I know the p0300 is a random misfire but doesn't really help. The codes cleared yesterday after I had them checked and drove home and I'm currently SES free, but the truck still runs like hell. I'm thinking maybe the fuel pump is going out and not sending the PSI out?

 

2001 GMC Sierra 1500 with 5.3L 2WD

245k Miles.

 

Any input would be appreciated guys.

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