So i get in the '82 GLT this morning, crank it over, and it starts for a second but ends with a pop kind of sound, similar to back firing through a carb. It stopped running when this happened. I started it again and it started running just fine, but a bit rough. It felt like it was maybe running on 3 cylinders? I turned it off again and went under the hood looking for something to stick out at me. Everything seemed fine, wires, belts, etc... I couldn't get it to run right, and being late for work already, i closed her up and ran to the DL to get to work, where I am now.
Therefore, i've had NO chance to check into this, but it's bugging me as i sit here looking at the board at work.
Any suggestions as to where i should start looking when i get home?
The only things i can think of would be the cam timing maybe is off now? or an injector died? Both of these i don't have much experience with, so maybe i'm totally off on that.

ANY help is great!
THanks everyone!
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John '82 242GLT / '83 244DL / '66 122S (crunched front end, looking for a home)