Does my 94 SL-2 have a timing belt and if it does when should it be changed? 84500 miles

Steel timing chain -- not a belt.

As long as you've kept your oil up, you should be ok for a while longer.
Typically it does not make sense to do the timing chain on an S car unless you're in there doing something else, except of course if it is becoming extremely </span>noisy and you fear it is gonna let loose.

I believe some of the older S cars had some design issues wherein an "insufficient" amount of oil was getting to the timing chain.

Probably good to 150-200K on a properly maintained S car engine.....

Derf