SOURCE: 2000 silverado 4.8 v8 runs bad when it is cold out side.
Try replacing the coolant temperature sensor for the injection system.
SOURCE: 1992 Silverado backfiring through the throttle body
you could put the pickup on a cylinder pressure test and see if you have a bad valve causing the engine to pop.
you could have a bad wire or spark plug.
the timming chain could of went off a cog on the timming sprokets causing to pop.
gettin to much gas could cause it to.
SOURCE: wont start has fuel and has spark
RC ralston
Your problem is a leak in the cpi pletium most likely the pressure line has a leak
had same problem with mine $45.00 PRESSURE LINE KIT AND $15.00 GASKET FOR PLETIUM and 2 hours labor problem sovled.
You can remove vortec cover and remove air regulator to look inside pletium. I had gas vapor on driver side . that is where fuel lines are. fuel regulator is on passenger side. turn key on and look in hole and see where fuel is spraying. taking pletium off you can again turn key on and make sure where fuel is coming from.
SOURCE: high idle will not lower
sounds like you have something blocking the linkage or the throttle body isn't closing totally or you have a air leak.
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