A couple things you might wanna check...double check to make sure you have no blown fuses...assuming they're all good, it is possible your Mass Air Flow sensor could be bad/faulty...fuel line pressure check...make sure all the fuel injectors are seated properly and working...clogged/bad fuel filter...when you turn the key to run can you hear the fuel pump "priming" the system? If not, possibly a bad fuel pump...and/or faulty wiring.
Hopefully that helps...
Good luck...
Jason
SOURCE: 2002 Chevy Blazer, car will crank but not start.
it could be a fuel pump they are quite common on the chevy trucks and SUV's. If it has a "Vortec" engine which it probably does, they run whats called a poppet nozzle fuel injecter that requires i think no less than abaout 53 psi of fuel pressure to run, you would have to put a fuel pressure guage on it to be sure and they are quite expensive
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