Dan,
I have a 95 SE 2.5 MTX. I have been dealing with the same crap for a long time. I thought maybe it was my tires as they were pretty worn out. I just put 4 new Kumo's on and already have had 2 changed out as they were "out of round". Still, same problem. So now I'm thinkin I'm going to pay the difference and move up to some Michelin X1's on Monday to see if the Michelin's best tire can get rid of the problem. I'm sceptical though - I'm not so sure it's a tire problem. The shimmy is intermittent and varies from speed to speed and does not always manifest itself at the same speeds. I too could really use some information on this. I think it's a front end issue. I can remember this problem going back a long time and since I have had alignments, new struts, springs, brakes, wheel bearings, control arms - all over a 5 year period. Nothing helped. Monday will tell the story with the new tires. Good luck to you.