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You will have to determine if the vehicle has spark as well as fuel pressure. Pull a plug wire off and ground it over the engine. Crank the engine and it should spark. If spark is ok, you will most likely have a fuel supply issue. You will need to hook a fuel pressure gauge to the fuel rail test port to determine if pressure is available. If no pressure suspect a fuel pump or power/ground supply issue to it
It could be just about anything was it driven normal before it died or was it acting up . make sure that the gas is actually getting to the engine if it is i would maybe change the spark plugs. then the computer again . but may start to get costly by guessing you may want to bring it in for test..
see if you have spark at plug from plug wire.
these gm cars have a problem with the ignition module under the distributor cap and rotor button.
when they fail, car dies suddenly and will not restart.fairly easy to replace and not to expensive.
Have you pulled a plug wire and checked for spark? Do you know for sure that your fuel injectors are firing? You can get gas all the way up to the fuel rail and nothing coming from the injectors. If there is no power getting to the injectors (check them for pulses while turning the engine over) The camshaft sensor will be the problem. They are known for just dying out. If this doesn't help, I'll still be here for you. Best wishes to ya.
Are you getting spark from coil wire when cranking? If so, check the cap & rotor. If not, the most common failure is the crank sensor. If you have a 4,0, you can find it on the drivers side of the bellhousing, in line with the flywheel, just where it's annoying to work on. There is a test you can make, but I don't have the specific test values or the correct terminals to check. (you can find that info in any half decent manual. Good luck