Maybe this will help Peter. I had to capture it in 2 pics because of screen size. The first one is the top half. The 2nd is the bottom with a bunch of the top included as a repeat.
SOURCE: 2002 chevrolet avalanche oil filter location
bottom rear of the engine at the transmission bell housing.
SOURCE: Loosing fuel pressure at rest?
YOUR CHECK VALVE IN THE PUMP IS ALLOWING THE FUEL TO DRAIN BACK ONLY FIX IS TO REPLACE PUMP.
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SOURCE: 2004 Chevrolet Avalanche 5.3 litre
I have seen Belive it or not Oxygen sensors cause this, if the sensor is pegged rich or lean on that bank it will make the fuel trim to rich or to lean and then the engine will misfire, check the wires to the oxygen sensors and make sure that they are not broken or rubbed through... there is a spot on the passenger side right where the wiring harness crosses the frame that i have seen them rub on and brake the wires.... if the wires are ok try and disconnect the oxygen sensors one at a time on the passenger side and see if the miss goes away..... if not i have seen one other truck where the intake manifold gasket on the passenger side had blown out and was causing a vacuum leak between cylinders and causing a missfire hope this helps some...
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