This sounds like a fuel starvation issue.
Is the engine running smoothly? Have you checked the injectors? What warning lights are on the dashboard?
Running the engine at idle, put some injector cleaner through the system. The only other reason could be a faulty engine sensor of some kind.
SOURCE: I Have a 2002 blazer that starts but motor dies, surges when accelerating
If this engine is a VORTEC then you may have a problem with the internal fuel system. Under the top plenum there is a fuel reg and poppet valves that inject fuel into the cylinders. Sometimes the tubes that run fuel from the reg to the valves can leak and cause your problem. This cannot be found with pressure check because this occurrs after the reg. PS fuel mileage will go down. Let me know if this helps.Moe
SOURCE: 1996 chevy blazer heavily misfiring
check to see if the oil cap is on tight,it wont run well if it is off or not tight...if it smells of strong gas fumes then replace the fuel regulator,the catalytic converters could be plugged,let it warm up as much as you can and use an infrared thermometor with the laser light(you can get at Home Depot for about $30.00)and check the temperature of the converters by aiming it at it and the temperature should be no more than 1500 degrees...or pull the distributor cap off and inspect for cracks and corosion..
SOURCE: i have a 1992 chevy lumina z34, its not getting
Have you checked that engine oil level is okay, if so check that oil pressure switch is good. The switch is usually bypassed to start the engine, but it won't run with no oil pressure indicated...hope this helps
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