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Fuel pressure regulator probabaly flooding it when you turn the key forward it primes but the regulator just dumps to much fuel into the cylinders flooding the plugs pull a plug out after you try starting it if it dont start and see if there full of gas
Fuel pressure regulator. It regulates the fuel pressure you receive going to the injectors. All the injectors would not be bad, so you have to take a step back to the next component, which should be the regulator.
sounds like the fuel pump isn't working. check your fuses. and when you turn the ignition on don't try to start it but just turn it to the on position and listen for a humming noise that would be you fuel pump pressurizing the lines if you don't hear a noise then i would replace the fuel pump. Hope this helps.
there is a tube system on the vortec under the mainfold the delivers the fuel called the spider and these are known to start leaking on higher mile engines, if there is any fuel in the engine oil you need to fix asap or bearings will get ruined and engine will be needing rebuild.
I have had similar problems and had to replace the fuel pressure regulator. It's a major expense because it sets below the diaphram in the intake manifold. Ask your mechanic about it, it may be the issue. I would get about 30,000 miles between replacement, I've replace it 3 times since purchasing the 2000 chevy blazer new, first one was under warranty.