Hi; Interesting problem. Lots of good suggestions. The resistor problem is one I've ran into and the jumper is a good quick test. You didn't say if the truck stopped while driving it or if it just wouldn't start one day. Two thoughts: Could it be flooding? Inconsistant with the need for the choke, but I had a carb power valve stick with similar results. See if the plugs are fouled. Other thought is that it may have jumped time - the cam/crank relationship - but only if it occured while driving. If you get it going let us know what it was.
Rich
