2000 Pontiac Firebird SERVICE ENGINE LIGHT WILL NOT GO OFF

Well, the converter, actually check the O2 sensors. I want to say there are 4 O2 sensors on the exhaust, but the computer readout should tell you which one it is.
I know when I drove mine on a long trip, one of the O2 sensors would trip a "Check Engine Light", but would clear on it's own.

As for the Cylinder two misfire, check the spark plug sires, and the Coil Packs.

I answered something similar on a post before, here: https://www.2carpros.com/forum/1999-pontiac-firebird-cuts-out-vt86769.html
It kind of gives you an idea what to look for.
I think (and if I'm wrong, I'm sorry) but I think Cylinder 2 is on the passenger side.
Easies way to find out which calender is 2, look on the Coil Packs (the black things that the spark plug wires are plugged into). One should read something like 1 / 4 2/6 3/5 (orders might be wrong), but the one that says 2 next too it runs your Cylinder 2. Follow that wire, and that's #2.

Check the wire (see the post I linked too before) for some ideas.