1998 Dodge Ram Stall and will not restart

Twice the truck has stalled and will not restart. The first time it eventually restarted. All the lights operate normally when the ignition switch is turned on. The ignition cranks but the engine will not turn over. The troubling thing is that when it stalls the engine just cuts out and none of the dash lights come on or warning lights are activated. The fule line was checked and there is gas under pressure in it. The coil has a spark when cranked but unknown if the spark plugs or wires are getting a spark. Any thoughts on what this is caused by distributor maybe?