1999 Dodge 1 ton won't start sometimes. There's no set pattern to it. Sometimes it'll crank right up, but other times ill have to try it everyday for a week before it'll start.

SOURCE: 1999 Dodge Intrepid Dies while driving and sometimes won't start

I could very well be the TPS throttle position sensor acting up. I had a very similar situation on a 99 Concorde with the same engine in it in my shop today. Go to a shop that is able to do a data stream on the engine. What it is, is they hook up a scanner and have the ability to watch all the sensors as the car starts/runs.

SOURCE: 1999 dodge 1 ton 4x4 dually 6 cyl. cummings auto

Probably bad instrument cluster very common problem on Dodge trucks. They also have issue with outside power distribution box.

SOURCE: 1999 Mercedes E430. Sometimes it will start,

The crankshaft position sensors tend to fail. Symptoms of this are: The engine will crank—but not start—especially when the engine is warm. The car may start again if it is left to cool off, but it may run roughly or have poor performance. Communicating these specific symptoms to your technician can save diagnostic time.

SOURCE: 1996 chevy silverado half ton v6 pickup problems starting

SOUND LIKE FUEL FILTER STOPPED UP.WEAK FUEL PUMP.CHECK FUEL PRESSURE.IT SHOULD BE 60 TO 66 PSI.ALSO CHECK VACUUM LINE GOING TO FUEL PRESSURE REGULATOR.MAKE SURE ITS GETTING VACUUM.IF YOU GAS IN VACUUM LINE GOING TO FUEL PRESSURE REGULATOR.REGULATOR FAULTY.IF YOUR ENGINE IS 4.3 FUEL PRESSURE SUPPOSE TO BE EITHER 41 - 47 PSI AND 58 - 64 PSI

Testimonial: "thanks will check it out some guy menchen something call the spider i gus it for the injecters"

SOURCE: 2001 Ram 3500 Truck: replacing powersteering pump on 1999 dodge 1 ton 3...

it is best to remove the pwr st. pump and vaccum pump assy as a unit which is held to the front cover w/2 15mm head bolt and a support bracket on the bottom bolt next to the block @ the pwr st pump. and disconnect all lines. get the seal kit and replace them @ this time. if you don't and just replace the pump you will probably develop an oil leak where the shaft meshes w/ the adapter.