Try cleaning or replacing (use only Ford part) the IAC (idle air control). I had the moose (1998 Mystique) a little in the summer,with hot starts running errands one day. Also, if you have aftermarket air filter, put stock parts back on. Check for cracked vacuum lines, loose air intake hose clamps. The 1998 Mystique already has the moose fix, the old 95's would stall if it moosed, until putting on the fix kit.
