What is the cost to replace cracked intake manifold on 4 liter, 2005 sport trac.

Check the temperature sending units first, (4L OHC I presume) there may be two of them & the seals go bad. They are held in with a horse shoe clip. Could also possibly be the lower half of the lower half of your thermostat housing. About $50.00 at Ford & $35 at O'Reilly.