It sounds like it could have something to do with the wiring harness. Did any of the connectors break? Any noticeable stiffness or brittleness?
It sounds like you might be losing fuel pressure when you give it gas. Or, it could be poor MAF signal.. or IAC acting up. It could be a lot of things still. You've gotta get out there and start eliminating possibilities. Try disconnecting the MAF and then starting the car. Do the symptoms change?