If you've got compression, and fuel, your lacking spark. I assume the engine is running rough, I would start simple. Check to make sure all the wires are snapped snug on the plugs. If they all seem attached well, pull that plug wire barely off, have someone crank the truck, and see if you've got spark. If not, work your way back. Maybe a bad wire, who knows. Sounds like an ignition problem. Especially considering it was the last thing tinkered with.