[garync1]

I would first remove the plugs and remove the main drive belt. From that point see if you can turn by hand. The reason for removing the drive belt and plugs takes all the accessory and some of the compression load off the engine. If it does not turn over from there you most likely have an internal problem. When it was running running rough before did it give an engine light.? If the timing chain was going bad seems to me it would have tripped a code for that. Cam sensor should have picked out a problem. If it were a drive accessory you should have picked up a belt squeal. But if the belt was new i can see it trying to pick up the load with out a squeal.Causing a no turnover problem. hope its nothing major.