Okay:
Here I go again, working on this 2002 piece of crap. The truck is a 5.9 quad cab. I keep getting rough idle when cold and every once in a while a multi-cylinder misfire code. Have done good wires (2 sets) new cap, wires and rotor, new coil. Can anyone tell me about a tech bulletin by Dodge about the wires and the installation routing. Can any tell me about the correct fuel pressure I might see when checking to see if the issue is fuel related. This thing is driving me crazy.
[:@]
Mark

 

I've seen this on other computer-controlled vehicles. Given what you have already done, a couple other things...

The first is to disconnect, clean, and reconnect ALL ground cables, lines, and connectors. I'm not familiar with those on your Ram, but modern vehicles often have a bunch and I'm not familiar with which are necessary for the engine control computer. I have seen really badly corroded connectors--especially in some parts of the country--and bad grounds can cause some really goofy problems. Unhook the battery and also check all other relevant connectors. For example, unplug and replug the actual computer/harness connector several times.

Then, if you still have a problem consider a bad 'puter (I'm assuming you have gotten no codes, whatsoever--should reveal bad sensors), and if still a problem about all that's left is fuel. Do you have a known good fuel filter? Lines? Have you had your injectors checked?

Spark, fuel, and air is all there is and we're rapidly running out of potential culprits.

All the best.