My 2004 2500 only had issues going up some steeper hills in the summer heat, and not even all hills at that point. I decided to see if my EGR was beginning to gunk up. I removed it, saw that it was slightly sticky, but mostly clean. After I cleaned it, the fins snapped back successfully like they are supposed to. I replaced it and began driving, but now, my turbo wouldn't engage at all. I realized like an idiot I hadn't plugged the sensor in before starting the van. I pulled over, turned it off and plugged in the sensor. Still nothing. I unplugged the battery for over an hour and upon, restarting, it was still in full limp mode. Is there some shorted circuit? What are some things I can trouble shoot now?