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Sounds like a fuel delivery problem. Has the fuel filter ever been changed? You can try banging on the bottom of the fuel tank with a blunt object ( hammer works ) while some one cranks the engine. If it starts suspect a bad fuel pump
Back to basics, as things fail while just sitting still sometimes. Getting spark to plugs? Correct fuel pressure? Will small spray of starter fluid make it start for a few seconds?
Check the tune up? Check wires for voltage leaks and distributor cap and rotor for corrosion. When you are able to start it spray the wires with soapy water and see if you can see or hear them arching. Do the same with the cap.
did you install the oil pressure switch origional to the tahoe? The tahoe uses a low oil pressure shutdown, instead of an inertia switch to shut off the fuel pump in the event of an accident. If the pressure circuit does not close within 3 seconds after the engine starts the fuel pump shuts off. This is in case the truck is on its side or upside down the pump will shut off.
SOUNDS LIKE YOU HAVE CONECTOR PROBLEM .CHECK ALL CONECTIONS AT COMPUTER. SPECIALLY POWER AND GROUND . CHECK FOR BURNT PINS AT COMPUTER . IF ALL GOOD YOU SHOLD REPLACE ECM.
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