Check the throttle position sensor it is used to adjust the idle when the engine is cold. The ECT switch by the thermostat outlet will sometimes send the wrong signal to the computer and tell the engine the temp is higher than what it is and that can also cause problems. Hope this helps. I would also check the cat and muffler and be sure the exhaust is not restricted. If it is then back pressure will not allow fuel to be drawn into the cyl. properly. Put your hand on the exhaust pipe and it can give you and idea if the exhaust is partially plugged or restricted. Hope this helps.
SOURCE: 2000 5.3L gmc sierra will not start
The battery could be your only issue here.Your engine management system will not work well under about ten volts. You battery may have low reserve. Try a new battery as it sounds like you will need one anyway.
SOURCE: low oil when engine warms up gmc sierra 1995
30-40 psi of oil pressure is fine for many vehicles including your GMC. I am assuming that the truck has more than 100,000 miles on it and still has the original engine in it. By rule of thumb you only need 10 psi per 1000 rpms in a typical street driven engine to give adequate oil pressure to keep the bearings from oil starvation. The oil pressure is typically higher when initial start up occurs because it is more viscous due to the temperature of the oil as the engines oil warms up the visconsity thins out and the oil flows more smoothly. The drop in oil pressure is a normal occurance. Above 45 is more than required for a daily driven street engine. I believe that the specs on that engine only list 30- 45 psi.
SOURCE: 1992 gmc chevy 350 wont idle when warm
This could be a number of things but i think that your problem sounds like a vacuum leak or an EGR problem. Try listening for leaks and try un-plugging the EGR solenoid valve one time.
SOURCE: 2004 gmc sierra 5.3. AC not working AC Compressor fuse blowing
UNPLUG THE A/C CONNETOR ON THE A/C COMMPRESOR. REPLACE THE FUSE AND TURN ON THE SWITCH. FUSE OK . REPLACE THE COMMPRESSOR AND THE RECIVER DRIER.
SOURCE: Misfires 96 gmc sierra 5.0
I suggest you have the injectors tested by the dealer, the sludge buildup will not cause a miss fire. to clean the throttle body use carberator spray while holding the engine idle high.
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