For my 99 Tahoe I discovered the problem is a worn key, no trouble since using the new spare key.. details here.. http://www.fixya.com/cars/t23311948-97_tahoe_run_but_shuts_off_whenever
Either it is not getting fuel into the cylinders OR the spark plugs are not firing. Could be defective ignition switch, blown fuse to the fuel pump, blown fuse to the ignition, bad connection somewhere, you failed to pay for your permit to drive from the Homeland Security Bureau
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