they think it was the coils in the magnetos. when they got hot (after 2 hrs of warm weather flying) they stopped conducting a charge. When they cooled, the plane handled great. They replaced the mags and the spark plugs. They told me that should fix the problem. I am still scared flying it and will be until I can circle my local airport for 4 hrs next summer on a hot day, just in case it quits again. It will be a boring but necessary flight, but being a controller, at least I'll be able to talk with my co-workers on the freq.
I called the Potomic Tracon and asked for a copy of the tapes, but they never got back to me, so if you know someone who has a copy, I would love to hear it. I have worked many emergencies but this was my first as a pilot. I prefer being on the controller side of an emergency..... less terrifying.