Subject: Mirage 2002 timing
Question:

One of the hold down bolts for my distributor was missing andthe other was loosened, will I now need to adjust the timing?

Answer: Jess,
If the car had been starting up and running smoothly with the missing and loose bolts, you shouldn't need a timing adjustment. You should replace the missing bolt and torque the other to spec. But if the car starts rough or runs/idles then you will need to have your timing adjusted.
Good luck!