[Dalaigh]

It's hard to say, with out actually seeing the truck or hearing it run.

I can take a stab in the dark at it, I'd say its probably a mix of things. The carb may need a rebuild, the fuel filter (the one under the truck) maybe clogged, the fuel pump maybe going out, or it's timing is out.

It could be one or all of these problems or anything else, but like I said it's hard to tell with out seeing or hearing the truck run.