I have a 2002 Ram 3500 with the 5.9L. Lately when we start it up from a cold start it will stall out (whether driving or if we just let it sit and idle up to temp) and it used to actually start itself back up if we were driving, but lately it takes quite a few cranks to get it back running. After which it seems to run decently ok.

Engine only has 88k on it
Have done a full tune-up, plugs, wires, etc.
Ignition Switch & coil
Fuel Pump has good pressure and power
Does not throw codes when this happens
All lights come on when we turn the key off then back on to restart (computer is working)

Any ideas where I go/check from here? Is there common problems with this engine that I should know about that could be connected to my problem?

also there is no warning/bogging/loss of power, the truck will just quit. sometimes at idle, sometimes while cruising at 40mph. Doesn't seem to care

 

If it quits while you are driving down the road, (foot on the gas) probably cam or crank sensor, or possibly PCM. If it starts right back up.... that makes it fun to diagnose. Need to find out what's missing. Spark, fuel, or both....

 

hmmm have you tested the alternator. I know I have had vehicles in the past randomly stall while driving with a bad alternator.

 

Sully has a point because if the coil isn't getting enough power then it won't have the power to send a good spark to the distributor and also not enough power to the fuel pump so there is a lack of pressure. I have to say I have been there and done that on another car and I changed everything but the alternator and I was pissed at myself for not seeing it earlier on before I bought expensive parts I didn't need. I always try to use the K.I.S.S. method (keep it simple stupid) and it has save my *** a few times.