I have been having trouble with the fuel cutting off (shortly after having it in 4 wheel drive) for the past few months and rough idling. I keep having to reset the fuel cut off switch. I replaced spark plugs and wires (because a spark plug shorted out according to the truck's computer) and it did not fix the problem. Also the O/D light blinks sometimes and it has trouble shifting gears sometimes. Everything started acting up around the same time.
What kind of spark plugs did you put in it? The 4.0 litre engines in these trucks require PLATINUM spark plugs. If you put the wrong ones ( regular copper) it will miss fire and run like a bag of garbage. I had a similar problem with mine, the previous owners said "oh we changed the plugs and wires". They also changed the ignition coil not long before I took delivery. So, truck still ran like **** they said they even had to reset the inertia switch under the passenger side kick panel, everyone thought it was a fuel problem. I decided to pull one plug and volia..Wrong plugs. That also explains why they had to change the ignition coil. Hope this helps.
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