Originally Posted by Jordan Y.
It runs fine if you turn the AC on? Turning the AC on raises the idle. Maybe the idle is set too low and it's letting it die out when the AC is off, or maybe the idle speed control motor is going bad.
I am going to have the Idle speed control checked as you are the 3rd person who suggested this..I have to go to the book store to see if I can find a repair manual for this truck..