I have a 1995 dually with a v8 360.
it has new plugs, wires, distributor cap, rotor, ignition switch, EGR valve, fixed valcuum lines, crank sensor, computer, o2 sensors, wiring has been redone due to mice, gas treatments, waterpump, fuelpump, air intakes filter, oilchange. Maybe some other things.
problem starts fine, idles fine, drive down the road and all he'll breaks loose. Pops backfires the more gas the louder and hard it happens,shakes. Let of the gas and it is fine hit the gas starts allover again. Happens 50% of the time. Feels like it is starving for power. Wants to go but just can't. If I'm driving down the road and I'm at 45 or 60 or 55 what ever, and it starts acting up it won't stop till I get back down to 30ish mph. I'm getting 35lbs of pressure at the fuel pump

 

The fuel pump should be putting out around 35-45 psi. With an engine running like that you should be getting a check engine light indicating what the computer is sensing. I see you have replaced the crank sensor, that could be the problem, if not it could be the cam sensor. From what I have read on this forum the Dodge does not like the aftermarket sensors, if that is what you installed.

 

It was hard starting....veryhard starting until I changed the crank sensor. Now it starts great. I get a check engine light after it's ran for about 45 min. When I had that checked it came back as an EGR. So I changed that and found that it had previously been blocked off.

 

Aftermarket crank sensor? That may be part of the problem...... these trucks simply do not like them.

Still have a cat?

 

No the cat is gone

 

What brand sensors? (crank, and O2)

 

What about the plenum gasket?
http://www.hughesengines.com/Index/p...p?partid=27091