Red Mnster Z

I got my LT1 in my car and started it up and the motor is running real rough, running rich and it doesn't want to keep running. It just wants to keep shutting off all the time. The ecm threw a code saying something about the MAP sensor (DTC 33). I changed the MAP sensor and it is still doing the same thing. I checked every electrical connection and they are all right. I also checked the spark plug wires to make sure that I didn't any of them backwards or something. Anyone have any ideas of what it could be?