The only thing I know of, on a gasoline engine, that will bite you is secondary ignition voltage. What about your ignition coil? If the vehicle will run, raise the hood in the dark, look for fire/spark jumping around.
SOURCE: 1993 4.0l v6 ext xlt
Sounds like your fuel pump is going out on you. Check your fuel pressure. You should have 40 psi when the key is in "on" position. You should have no less than 5 psi under that when it's running.
SOURCE: motor missing on my 1995 3/4 ton chevy truck.
compression test the cylinders... could be gasket / valve leakage so its worth a try. if low readings on any cylinder then remove head to find out problem.
SOURCE: 1997 Chevy C1500 pickup won't start?
You need to have the ignition control module checked (It's inside the distributor)
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