2000 5.3 Yukon will start but won't run

[H8 PVMT]

Wife was driving the Yukon and the power started pulsing and then died. It would start right up, rev to about 1200 RPM then chug and die. Got it towed home, read up and cleaned the MAF sensor, cleaned the throttle body and replaced the TB gasket and replaced all the O2 sensors. Throwing code P0300, P0171 and P0174. The EGR valve seem to be working if I'm reading the Chilton correctly. I can't drive it anywhere to have it checked out so I have to try and figure it out.

Any suggestions?

The Yukon has 275k on it.

I don't think its the fuel pump, one because it starts up every time and I can hear the pump when I turn the ignition on. Fuel filter maybe... not sure I've ever had a vehicle not run due to a fuel filter but maybe.
Air filter is a K&N, it's clean.
New plugs and wires

ugh...

 

[ISU-152]

Security

 

[rockola1971]

Clear the codes and see if any reappear. Just because you can hear the pump on doesnt mean it is producing the correct fuel pressure at the rails for the engine to run. Is your security light flashing on the instrument cluster?

 

[oldchev]

See my Post "2004 Yukon 6.0 Engine Stall". I'll throw this out there...Your pump may be running intermediately. That'll give you a lean fuel trim (because its about to die) then the pump starts running again and so on. I bought an inexpensive fuel gauge tester (about $32) that reads 0-100 psi. It screws into the schrader valve fitting on right bank.
Keep us cut in on your progress and decision.

 

[Brains646]

I had this happen to me and it was the throttle body. At first it started stalling but would always start right back up and run until I gave it gas then I'd have to really gas it. Then it started bucking and stalling while underway and got harder to start. I cleaned the throttle body with regular cleaner and it helped a little but it still wasnt right. I got a can of Seafoam upper engine cleaner and ran it thru the throttle body and VOILA! It purrs like a kitten now.

 

[H8 PVMT]

Fixed.
It was the fuel pump. I bought a fuel pressure gauge and with the ignition on the pressure at the rail was around 11psi, enough to start the truck but not enough to keep it running.

I changed out the filter and the pump. Along with all this other mess I ended up changing the O2 sensors, all 4. Cleaned the MAF and the throttle body and new gasket. Also put on a new gasket for the EGR valve and a new PCV valve. She runs like a champ now.