Any way, probably 5 minutes after that I felt a slight hesitation, I thought nothing of it.....then again.....then I noticed my afr readings were going very VERY LEAN and well into the red and the car hesitating even more...got to the girlfriends house switched it off,grabbed her and some pressies and got back in the car to make the return journey home,on any thing other than a very VERY LIGHT throttle its hesitating and the afrs are extremely high again......then all of a sudden a noise starts to develop,it sounds like a firework being set off without the bang at the end, a very loud whistle/wining noise. At this point I turned round and went back to the gfs house and left the car there.
I'm thinking perhaps a boost leak? But would that not cause it to run very rich? When I've blown pipes off before it's blatantly obvious and the car comes to a stop, I've not had chance to have a good luck yet but there was nothing obvious (literally had a look for 30 seconds).
So... thoughts,ideas,things to check etc?
Won't be getting the car back until tomorrow now.