1999 GMC Yukon Denali Questions

Unanswered 1999 GMC Yukon Denali Questions

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Driving home, it started to sputter. Made it home then it wouldnt start. It turns over but doesnt start. Someone told us it could be the anti theft system.
My check engine light isn't on and the vehicle runs great other than the above problems and it has 335,492 miles on it.
I have a 1999 Denali and the headlights come on during the day, but at night they shut off.
also burns oil but no smoke from tail pipe not leacking?
I was listening to it earlier today it was working just fine. Dont know what went wrong.
Just stopped working.Does it need new fuses?
lights wont come, lights will come on when egnine not running.1999 gmc yukon thinking it the multi switch