id start by checking the idle fuel cut solonoid is working. i never had one stop working but iv had the o ring on the end get wore on a couple different trucks and it caused the trucks to die randomly at stops. slowly it gets worse until the truck dies at every stop and wont idle. the o ring is under $5 at the dealer and sometimes it can be next to impossible to tell there bad just by looking at them. good luck
80 shortbed-22re,w56,Marlin 23 spline dual cases,HighAngle drivelines,RUF/63"chevy's,35''mtr's,85 front axle,30 spline Longfields, Allpro highsteer.87 rear axle,5.29 gears,rear spool,BudBuilt cm, marlin HD clutch,ramsey 8000 winch.
Also 84 toy DD 22R 4.88s,33'' toyo mt'z, marlin clutch,4inch lift/63's, HA drivelines.