First thing I think about when that happens is the infamous stepper motor - pull it, clean it, and see if this helps. Also see if someone running the same engine will let you borrow it for a few minutes. Your fuel efficiency should also drop off pretty badly with a bad idle air control valve.
Other things to look for could be fuel pressure related (clogged filter, pump on the fritz, a relay, fuel injectors), or electrical (plugs, wires, distributor, coil).
Let us know how it goes...
Good luck!
Oh, and isn't it time you switched your avatar to something, say, for Valentine's?
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MG
'95 Disco I, 3.9L V8i 5-speed
Discoverying Bolivia...
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