Well, after having the new wiring harness on for 4+ months, my surge issue came back again yesterday morning. And wouldn't you know, it happened while I was driving a couple co-workers and myself to a conference! Talk about a panic situation on my part - 5:30 AM and 45 miles from home and work and my "good" truck (as they call it), starts to die on the road. I limped it to the conference center, and pulled the wiring harness off. Ran just fine after that. I'd been noticing bad fuel mileage for a about 2 weeks also. I wonder if my truck's connectors, like being high on the tolerances, that the stock connection can compensate for, which quad's cant.
ps. On edit. This thing is a DOG without the box!