I've got one the same year, 280k 3.1 diesel, fairly good SUV, but heavy and slow.
Check front CV joints, will click when turning, at full lock if worn. in $X$ (4x4) both mine have failed,
I had a bolt come out on the torque converter, and get jammed between the flywheel and housing, locked up engine, so had engine, out to repair, luckily this happen in the driveway, I was attempt to figger out the noise at the time. rebuilt Engine while I had it out.
Check glow pugs are all working, or it will be hard starting when cold, $20 each.
I bypassed the emission's egr in mine, was heavily plugged with carbon and soot,
4" exhaust will improve power, as engine can breather better,
turbo waste gate line can be plugged off, for better response,
I wouldn't recommend spending a bunch, on trying to increase performance, its an old vehicle, with a heavy pig of engine, and heavy body, ride ok, but no racehorse.
find out about the timing belt.
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