I have a 93 5.9L engine ramcharger that has been sitting idle for a
little over two months. Started it up with no problems. However when
driving down the road engine starts to lose power until it quits. After
sitting for about ten minutes, engine starts up with no problems.
Same thing happens when engine warms up. Any ideas??
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Could me an electrical component cutting out or a fuel supply issue.
When it quits check to see if the injectors are squirting propper.
Check for a spark.
This can help to determine which direction to start with.

 

could be the fuel pump, or fuel filter.