PS- while your in there..
Carefully take out the MAF element (using the special screwdriver), and clean the little elements sticking out of the unit, using brake and parts cleaner (just spray it down til the elements don't have any black carbon on them anymore). Guaranteed to make car run better (if it had deposits prior, which it probably does). I've fixed several FORD drivability complaints at work by just doing this one thing alone
