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Re: Engine check lite
check the mass air flow. they make a cleaner for it at your local parts store. take it off the truck. its the part that has the wiring harness by your air filter box.
also check the wiring connector and wiring harness for the maf for any bare wire.
the maf is responsible for the majority of all the running parameters with the obd2 systems. fuel and spark mainly but it will also mess with tranny shift points and cause alot of erratic problems
my 6.0 was kinda doing that, felt like it would almost loose a cylinder or 2 then go back to normal and i found out that a wire for my maf was rubbing on my cold air intake and started grounding out
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1987 v20 regular cab - work in progress swapped in a (1992 tbi 350 with vortec heads) old motor. currently has an 8.1l and 4l80 swap. flatbed bed 2 inch lift and 64 inch spring swap in the rear. 
2002 chevy 2500hd extended long- blackbear tune. DD
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