This has been doing this off and on for a year just out of the blue it will do it then starting running find.
I'd still look for a shorted wire somewhere. Electrical issues normally don't get better. I had a 4runner that had no dash lights, radio, wipers or turn signals. I chased the short for weeks until I finally broke down and purchased a factory wiring manual. Turns out there was a common wire to all the components than ran along the top of the transfer case. I check the wire and it had the insulation chaffed off of it exposing bare wire to the top of the transfer case. All it took to correct it was a little electrical tape and I was back in business.
Electrical issues can be a real pain. Hope you find the problem whatever it is.
Looks like this is a common issue with your truck.
http://www.carcomplaints.com/Dodge/Ram_1500/1999/electrical/stalls_while_driving.shtml
Here's a link to a forum I belong to. It discusses the same issue your having except it's for a '95. I would register to this forum if you haven't already and search the database for the 2nd generation trucks. It may help you locate your problem.
http://dodgeforum.com/forum/2nd-gen-ram-tech/272545-engine-stalling-at-speed.html
Hope this helps. :toast
Happens to be one of the few problems I havnt had with my 2nd gen. Is guess fuel pump, cps is viable but when a cps goes out its gone. Could be a bad vak leak how does your plenum gasket look?
fuel pump sounds like a a cheaper route out but would it just shut off like all power was killed??? I just don't want to sink a butt load of money into something that I don't even know for sure that it is the issue. Question? wouldn't the fuel pump show a codewhen it was put on the computer?
