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Does the coil produce voltage? I know it has power to it, but is it throwing voltage? if so check the coil wire at the distributor. if power is reaching the distributor but not throwing spark from any plug wires, your problem is a bad rotor and or cap. Or bad wires.
I had a similar problem and believe it or not it was the CAT. An easy way to test for this is to remove the O2 sensor right in front of the CAT. Once you removed it, plug it back in while unscrewed from the exhaust pipe and start up the truck. If it runs fine, the CAT is your problem. This is just a guess and it would be an easy and very cheap($0) test. You did not say if the truck was diesel or gas. Mine is gas that was exhibiting the same problem as yours...good luck!