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Fuel pressure should be around 50psi. Make sure that the injectors are receiving a signal from the computer. Does it run if you spray starter fluid in it?
If it starts for 5 seconds out less, and you notice a security light on the dash, go to this link for answers. Gm are notorious for failing antitheft systems
http://vatspasslockpasskeysecurityhelp.yolasite.com/
When you say it won't start, do you mean it cranks but won't fire, or it just won't crank? If it just won't crank, you could be having an issue with the starter relay. The often become intermittent before failure. Many owners do not know there is a starter relay because it was added as a recall item i order to protect the iginition switch from burnout. The starter relay is located in the very front of the engine compartment, just to the left of the battery, on the back side of the radiator crossmember.
hi i have a 1997 chevy tahoe that starts but won't stay running i have changed fuel pump, fuel filter,relay ,spark plugs, and just changed rotor and dis. cap ready need some help to figure this out please.
there are 2 sensor on the carb . you may need to replace both to find out whiche one it is . try this also give it gas while starting and when it starts you will have to keep your foot on the gas a little to keep it running if it runs that way its one of the 2 senors .
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