i've had a problem similar to that in the past ran fine until you tried to put boost into it.

.

they had the ecu off checked all manor of things and is was a 30p hose

(finger size hose not the big ones).

had a small tare in it near one of the sensors.

if mine wasn't in bits i'd photo it.

can have a look tomorrow if your still stuck.

(turbos f@#ked so taking the opportunity to fit charge cooler and decat.

.

what a nightmare its turning out to be.

nearly there now)