While threading in one of the bolts for sti tranny mount, it wouldn't tighten.

Right now everything else is tight, though I'm not that confident with this bolt. But it is tight enough that I can't move it by hand. And driving around didn't show any problems.

Should I take it off and try putting it back one with Loctite?

Try loosening the other bolts 3-4 turns, then loosen a bit and try tightening the 'stuck' bolt a bit....if it tightens without binding, tighten all of them in stages a bit at a time until proper torque is achieved.
If after loosening the other bolts the 'stuck' one is still stuck, re-tighten the others and keep an eye on the 'stuck one. If it falls out, get the proper tap and chase the threads and re-install a new bolt.

Thanks I'll try that tomorrow morning..

Could not find any place that carried the 14mm thread repair kit..

Are there any other options? Ie. Filling the area with an Epoxy based repair kit?

Kind of hesitant with playing around with it anymore, cause I will be in a worse situation if the bolt falls off.

Drove around for 30 or so miles and the bolt seems to be ok..

Heli-coil fix. Akit purchased from Sears/ Hardware store. You basically thread in an insert w/ I.D threads as well as external threads.(Screw in Heli-coil, then screw bolt into heli-coil.) I had 1 bolt as well that wouldn't fully tighten. 10k and no problems. I frequently check(once a month) for bolt backing out. When/if it does=HELICOIL time.

Thanks, couldn't find one yesterday so I had to order it.. That should do the trick for a more permanent fix..