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Gas, air, spark. Keep it simple. Is it spark? Could be bad gas. Put some gas from the fuel line to make sure it's clean. I recommend Getting some carb cleaner and spray it in the line and see what it does.
Do compression test first. Have you got a blocked air intake? Sometimes people put a rag over the intake tube inlet when blowing outthe air box & forget it & it gets sucked in & blocks airflow. The things I think of are straight away are Spark, Fuel, Fuel pressure, Air, Timeing, Compression
Why are they stuck? Is it from setting and there rusted up? or are they sezed up from lack of oil? If its rust just take some trans oil and pour some into each spark plug hole and let it set over night, and then put a socket on the harmonic and turn back and forth until it frees up. If its lack of oil its my best guess you better look for another engine.
That sounds like it could be one of many things. Have you ever given the truck a tune up? I suggest the following things first.
New Air Filter New Spark Plugs New Plug Wires Oil Change (and filter)
These are the basic necessities of an engine. Having a dirty air filter, or plugs that are firing weak can surely cause this problem. Try giving the truck a good old tune up and see how it starts then.