Yorkie, I reckon it's your IMRC solenoid. This is a common fault with the LT. Fault code 2008. Same symptoms you're describing when mine had an issue. It's a cheap part new, from a dealer, around $85 [Ford part number: F0 4M5G 9J559 NB] and from Ebay around $35. I think the Ebay versions are newer designs too.
Simple to change over too. Made a world of difference to my Focus once changed.
It's dead centre in this pic. The blue plug runs into one side of it.
