can any 1 help i have 1.9tdi(awx) the oil seals went last week so i sent it away 2 midland turbo where it was re-cond. i got it back yesterday put it back on now i have no boost and lots of back pressure. it never had this problem before the turbo went. the engine has only done 60.000 miles. i have also changed the oil and filter. the engine breather is also clear. can any1 help???