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is it blowing black smoke. if so it may heave bad temp sending unit. there are two . the two wire unit tells the computer to adjust fuel at the right temp.your vehicle feeds more fuel to a cold engine and cuts back fuel as engine warms up
Thats not good ! I suggest that the truck be started and warmed up a while. Then try to drive it around a bit in the yard or where ever. If that doesnt work out the suspected clog, then I would roll under the truck and look to see if something hasn't eatten away at the wire harness for the trans.
it likley to be blocked jets,,,try tipping a drop of gas ie:10cc,,only into each plug hole then try starting it up, if it just bursts into life and cuts out again its all down to no gas getting to the engine,,,also engines do dry out if left standing around so the drop of gas will lube the pistons as well
Have you chg. fuel filter? If so, best to do a fuel pressure test, sometimes( not always) when the pump gets warmed up they can loose a little pressure and thats all it takes just a few # under recamended p.s.i and the truck quits running, you may hear the pump run but its not putting out the correct pressure until it cools down and it starts working again, but after a while quit all together.
I have the same problem with my 97.... especially shifting from 3rd to O/D... I've had the tranny serviced and flushed.... It still does it until the tranny warms up.... the tranny's in them are temperature picky!!!!! It's the nature of the beast!!! Wait until spring and everything will be good until next winter!!! If you're really concerned with it you can put a "cold front" on it or block half (NO MORE THAN HALF) of the tranny cooler with cardboard thru the winter months