[Awilli]

Wednesday, cruising home at about 60 mph ,Heard a "POP" from under the hood, instantaneously got -OIL,VOLTS,CHECK ENGINE SOON lights.
Thought it was serpintine belt, belt was fine. Tried to start,backfires, acts like timming is off. Had to have it towed home, had my son try and start it while I watched under the hood, (I did have the bearings go out in the ALT. pulley one time on a 91 Suburban), I thought maybe same here, but everything was turning fine.
I need some HELP! here. I'm trying not to think its a valve or a spun bearing or something this close to Christmas.

P.S. 162,000 mi.