According to <http://www.obdii.com/codes.asp>:

    Ford/Lincoln/Mercury    P1506    Idle Air Control Overspeed Error

  Looks like there's a problem with your IAC.

Hyster E60XM-33 1996 Mercury Mystique GS, Zetec, ATX To email me, remove the string HatesSpam from this address:BobHatesSpam@Blaylock.to