Service engine light stays on

run fault codes and check for HO2S and O2 sensors problems . Check fuel pressure and injectors for operation.

Yes it may be the wires are shorting or its actually the problem with instrument cluster.
Also get the vehicle scanned for any error codes stored in computer this will confirm whether is short circuit issue or actual problem:------
I suggest you few help links with accurate solutions to refer/go through:----Click the link below:------

Battery and brake Warning lights on Dash
http://alltypesofpartsreplacing.blogspot.com/2012/10/battery-and-brake-warning-lights-on-dash.html
--------------2002 Ford Windstar: Brake Warning Light ON dash? http://schematicsdiagram.blogspot.in/2012/06/2002-ford-windstar-brake-warning-light.html
-------------ABS & Brake warning lights remains steady on dash? http://schematicsdiagram.blogspot.com/2011/12/abs-brake-warning-lights-remains-steady.html
-----------Chevrolet Tahoe Hood open warning on dash and alarm sounds? http://schematicsdiagram.blogspot.com/2011/12/chevrolet-tahoe-hood-open-warning-on.html
-----------2005 Chevy Impala: Service Vehicle Soon Warning Light? http://whoisbyme.blogspot.in/2012/06/2005-chevy-impala-service-vehicle-soon.html -------------- Malfunction Indicator Light ON http://whoisbyme.blogspot.in/2012/06/malfunction-indicator-light-on.html
-----------Car Runs Fine But Check Engine light is ON?

http://whatisbyme.blogspot.in/2012/05/car-runs-fine-but-check-engine-light-is.html

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Check engine light with codes P2195 and P2197?

http://howtobyme.blogspot.in/2012/01/check-engine-light-with-codes-p2195-and.html

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How to Read Codes from Check Engine Light? http://schematicsdiagram.blogspot.com/2011/12/how-to-read-codes-from-check-engine.html
-------------These will help.Thanks.

even though you may have had a intermittent issue check the pcm there may be a code that will help you when/if this happens again

I am guessing that it will start only for a second or two then stall out. Well for this you need to turn the ignition on and then try to start the engine. Then leave the ignition on while the security light flashes. It should then stay on solid after about 10 minutes. When light stays on solid then turn off ignition for about 20 seconds then try to start. It should start up. Hope this helps.

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.

unfortunately on this type of service (internet) it is hard to deterine what is causing the check lamp to come on.........but the reason it is running bad is a thing called "limp home" mode. previuosly, if cars had a fault that was serious enough, the computer would shut the car down, having it to be towed
these days the limp home mode was established, because if the car was driven with the fault, then it would cause excessive damage.

my advice would be to take it to a chevy dealership and get them to diagnose ONLY, then come back and we will share what we can do with it

The air bag light will remain illuminated if a fault has been detected in the air bag system.
The onboard computer will need to be interfaced with diagnostic equipment to read the fault.
This is also the only way to reset the light.
Good luck, I hope this helped.

usually, this is an ignition switch problem.

There is a reason that the light is on. You should check to see what code or codes you have and go from there.

is the distributer in correctly those only go in way only and there is no adjusting timing on those motors assuming it is the vortec motor