I'd give the fuel system a go first because it is inexpensive and easy. Do it in this order:
1. Get some diesel purge- I use Powerservice diesel additive, others use Howes (there are a bunch). Put a slug of it in the tank- you can put in a little more than directed just to clean the place out
2. Replace primary (in-line) fuel filter- white plastic thing before IP
3. Replace secondary (spin-on) filter
4. Run the car at idle for an hour or so, and rev the engine if you want to- get that purge going through the system
5. If this doesn't completely solve your problems (which I suspect it will) clean out your fuel tank screen

If it turns out that none of this helps, change your transmission fluid. That should do it.
Good luck.

__________________
Andrew

1989 Volvo 745- 202K