If it were me, the first thing I would try is gas treatment (maybe water in the gas). I am having very similar symptoms on my 1994 that I just didn't start for a month, and had some heavy rains. I added Chevron Techron treatment which made a noticable difference.
Something else you might try if that doesn't help. I have heard that these cars in particular have real problems when their catalytic converters get old and clogged. Loss of power, not idling until engine is hot, starting and stalling after 2 minutes and then not restarting, (I had a friend with this problem). If I remember correctly you should be able to unbolt and remove the exhaust right after the O2 sensore, but before the cats. It will be loud but you should be able to run it long enough to see if it improves idling.
Good luck.
Ryan
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Saturday, October 3rd, 2009 AT 3:10 PM