Hello and happy New Year to all!

This morning at a red light, my 1991 (180K miles) which has been idling rough (but running great) for approx. 3 months suddenly started sounding and feeling like it's running on 5 cylinders.

I got it to my office across the street. I starts but, again, it sounds like it's misfiring.

Any ideas for a complete auto novice to get me through the weekend until I can bring it to someone?

Nick