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Interesting. Its possible the vent for the gas tank is not working - - you might try running the truck with the gas cap loose to verify. You have checked the carb and you know for a fact there is no fuel inside it when it dies ? And you know the pump is not pumping fuel when it dies ?
This was possible in the older ones the newer cars are not that way, a scan tool is the only way to get the codes that i know of but anyway this problem you are having sounds like a fuelpump problem, try a quick trick, have someone try to start it while you beat on the bottom of the fuel tank with a rubber hammer, see if it starts, if it does then the pump is bad, sometimes shake it will make contact and get pump going, i thing this is why there was no power and the sputters and spits.
have the fuel pressure checked when starting cold, also have them do a fuel pressure leak down test, this test requires a special test gauge, if you are going to do the test buy the gauge, about $40
If it sputters or hesitates while driving I would suggest a new fuel filter. If it runs smoothly and just dies out you may have a fuel pump which needs to be replaced because it is going bad. If fuel pump relays or other types of relevant fuses are blown it would not start at all. Your mechanic could also pull a spark plug and check for a blueish white high voltage spark if it has an orange or reddish tint that would denote a lower voltage spark normally from a worn out coil pack, spark plug, plug wire etc. Through advanced engine diagnostics you can have your vehicle connected to an oscilloscope or a cylinder dwell meter which can cancel out spark to each cylinder to check for function. However your best bet may be the fuel pump, if your vehicle dies again check to see if your vehicle is getting any fuel first then you'll know for sure.
I have the same problem on my 95 grand cherokee laredo. Sometimes it starts out fine and after about 10 miles it starts spitting and sputtering. Then after a while it seems to clean out and run fine again for a little while. Then other times it starts out spitting and sputtering at the begining. I changed the fuel filter and that was not it. It is a 4.0L 6cyc. Any Ideas?
if there is not a vacuum leak it seems that the signal wire to the MAP is either open or shorted to 5 volt reference wire. if not either of those may be the PCM
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