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Re: Rough Running Dually
My next thing to suggest was the ignition module also. They can be finicky when they go bad. I do believe it is something simple just gotta figure out what.
I also wanted to make sure you double checked all of your vacuum lines. Make sure everything is in its correct place. I think there might be a diagram on your radiator support showing this.
You have said it does it when cold and under a load most of the time. I wanted to ask if it backfires as much if you rev up in park to 3-4k rpm and hold it there? Once your holding the accelerated pedal and rpms steady does it still backfire and rum rough or does it smooth out?
The reason I ask is because when your butterflies are open further it equalizes the vacuum system more (I hope I said that right). So if your butterflies are open then the vacuum isn't being drawn through the gaskets and therefore wouldn't act as a leak. I hope that makes sense.
Also get some starter fluid and some time and spray around your intake gaskets and the TBI.
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