I found a TSB that might apply to your problem.
Check out this site for more info.
http://www.ecpe.vt.edu/%7Edfritz/technical/tsb98/18_36_98.HTM
<< >Has any of you guys expereinced truck won't start or doesn't stay started.
>if
>i put my foot on the gas a little it stays started but as soon as i let off
>the gas it dies. Also the last time my truck did this (yesterday) i held
>my foot on the gas for a while to get my truck warm and that seemed to do
>the
>trick and it stayed started without me on the gas. when it dies my tach
>goes down, when i hold on the gas i try to stay bewteen 2000 & 4000 rpm...
>I replaced my factory spark plugs with champion truck plugs around 10,000
>miles ago, i have a msd setup with 8.5mm wires and i have a cold air
>airraid intake... after my truck stays runin ( after it gets warm) it
>run
>perfect flawlessly. Please help....
>
>I have a 99 dak with v8 318 4x4
>many mods...
>Brent Jones
>newark, DE
>
>>
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