SOURCE: My 96 yukon wil not
try spraying some carb cleaner into a vaccum hose and see if it will run. If so then you have ignition but no fuel delivery. If not then you have an ignition problem. make sure you hear the fuel pump hum when you turn the key to the run position. It should run for +/- 5 seconds then shut off. remove gas cap and listen for fuel pump operation through the fill hole. If you can hear the pump then you have a fuel injection issue. If the engine starts and runs for a few seconds then shuts off then you can suspect the crank or cam position sensor. The fuel pump runs through the oil pressure switch which could also be an issue.
Are you able to start the truck with application of the gas pedal?
SOURCE: I changed the steering column on my 2005 Yukon Denali and now it will start but won't stay running.
You probably interrupted the antitheft system. This link explains.
http://vatspasslockpasskeysecurityhelp.yolasite.com/
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