I have a 96 Legecy 2.2 with about 97K.  It starts fine and runs fine for about a minute or so or until it reaches operating temp.  Then it start to miss and does so for about a minute then clears up.  I have change the plugs and wires.  I have checked the injectores for pressure and pulse they are fine.  I have replaced the knock sensor no help.  I put a different computer in it and that made no difference.  The only code that comes up is misfire on cylinder one or cylinder two, usually on number two.  I also checked to see if a valve quide was loose as I heard that sometimes happens on this year.  If it would not clear up maybe I could figure it out.  Has anyone had this problem or have any suggestions?