The EGR valve makes some sense, as do the various sensors mentioned. The mechanics say that it sounds like a fuel pump that is maybe starting to go out, but with as much money as I've thrown at the thing in various repairs already, I just can't afford a $400-$500 guess only to find out it is something else. They said that it also almost sounds like it could be a catalytic converter starting to plug. That's actually what I thought at the point where it was bogging down so bad, as it sounded like it just couldn't "breathe", for lack of a better term.

I've got it up on the carport now, and it looks like it will be incumbent upon me to make it act up before anyone can diagnose it. I have my own business and can't afford to have it breaking down on me while out at jobs, costing me yet even more money. So, I'm going to let it run on my carport and see what happens if it just sits there running, for starters. Perhaps I'll shake some wires and see what happens. If shaking them, or "moving stuff around" under the hood fixes it, then it should conversely break it. Maybe I can isolate it somehow.

Right now it runs and starts beautifully. I have to put a stop to that, lol. Somehow it has to break down so that we can fix it.

The whole "lighting it on fire" thing sounds easier though.

 

I believe I have what may be your problem. I have just repaired a Caravan in the shop with the same problem. Move the wiring harness around and runs great for a while. I wasn't happy with that so I started searching the wire harness and found that where the harness for the injectors and intake sensors (this is at the back of the rear valve cover)connect inside the harness wrapping the wires had melted together causing the injectors to ground out and flood the engine with fuel. This harness is also over the exhaust manifold in the rear. I am talking about a 3.3 vin 3 v6 engine. Some warning signs are check engine light with several codes dealing with the injectors and sensors. there is 10 wires in the connector and this condition could cause several different problems. Hope this helps.