Weird misfiring problem.

[Kevin 1G Drummer]

My car is a '92 gsx, mostly stock except for a small 16g, and a MBC. It first happened on saturday, and has happened one more time since. Both times it happened, I went to a store, and on the way there, everything was perfectly fine. When I went to leave, it was idling very rough, and when I went to drive away, it was running like it dropped a cyllinder. I drove for a couple blocks, and it didn't go away, and turned on the CEL, so I pulled into a parking lot to check if something had come loose or something, but everything was perfect. By the time I got back into my car, the CEL had gone out, and it was running normally. I looked everything over, and everything seems normal, so I have no idea what could be causing this. Does anyone have any suggestions?