I was installing something in my Monte, following the instructions the company provided, and I disconnected and reconnected the ECU while the battery was still connected. Now I'm getting a cylinder three misfire. Have I cooked the ECU? Nothing else was disconnected, just the ECU.

Edit: Before panicking and purchasing a replacement ECU, I figured I'd try the basic "unplug it and plug it back in". This time, I made sure to dissconnect the battery. After dissconnecting the two ECU connectors, I removed the orange seals on the edge of the two ECU connections. They wern't staying on the lip of the connectors, and I suspect that they were causing me not to be able to fully seat the connectors. After tightening up the two connector bolts, and reconnecting the battery, the car ran fine. No missfires, funny sounds, vibrations, or check engine lights. I probably seem like I have no idea what I'm doing, and I'd say thats fair. Vehicle electronics aren't my forte.