Hello, I have a 1997 1500 with the 5.9 in it & I'm having an issue with it running rough & stalling after about 20 minutes of driving. It won't start for a while afterwords & just seems to load up of fuel. I have replaced the plugs, cap, button, wires, coil and cleaned out the IAC. My exhaust is broken right above the front differential and I was wondering if this would cause the issue? ANY help would be appreciated, I've had the truck down for about 7 months trying to trouble shoot it on the cheap.