the first thing i would be checking is the accuator rod on the turbo as this has caused a number of problems for others!!
it seems that the rod is held on by a small 'c' clip which drops off and causes the rod to dismount from its locaton!!

worth a quick look just incase!!....may save you a little of your earnings!!

if so you will need to source a new 'c' clip but ford don't sell them seperate!! try you local hardware store!!