I would put money on the clutch dampner being your problem. I *think* they used them in the 92 Troops. Isuzu was a little random on what vehicles used them and which ones did not. Follow the line from the MC and it should go through a small, 2" square item before it gets to the SC. It should also have a bleeder screw on it. These things like to stick (especially on a 16 yo vehicle) and they act like a check valve. Personally, I would suggest bypassing it as it should make no real difference. Their purpose is to allow the clutch engagement to be "smoother".

You can also replace it if you like.

Good Luck,
Michael