Codman - if the car stalls approaching corners, stop signs, etc, with your foot off the accelerator pedal, check out the electric sensor in the speedo drive housing at the back of the gearbox. The other common stall culprit is the stepper motor and valve on the throttle bypass.
http://www.aussiefrogs.com/forum/technical-performance/116639-inside-gti6-4.html
Not so straight forward sadly