2012 GMC Sierra 5.3
3 Answers
It could be many things. We would need more details to help. Post more info below. If your on the side of the road, have it towed to your house or a garage for repair.
Guru9ZMT28 answered 3 years ago
Heard ticking lost all power then died on the side of the road tried to start turned over very slow had it towed home changed all lifters rods new gaskets thought it was a bad lifter but it is still turning over slow with no fire with a brand new battery
Check timing , it may have jumped time , with all the lifter work and all.