i need some help to try and figure out this problem. the timing belt snapped on the truck and ever since it was replaced it idles very rough and will barely go above 45 mph. any ideas on what this could be? something to do with the timing? any help would be greatly appreciated, thanks.

 

I sounds like to timing belt is one tooth off. I would remove the cover and verify timing marks are correct. Hopefully no valves got bent as I do not think this is an interference engine.