I've got a weird problem with my astra turbo. After a random period of time the car will develop a weird problem;
it's as though the throttle is 'delayed'.
i.e. If you change gear quickly the revs rise as though you've left your foot on the accelerator.
If you accelerate and then simply let off the accelerator the 'dump' is delayed (again as though my foot is still on the pedal)
If I turn off the car, and back on again then the fault immediately disappears, only to return later on. - again at this point a restart cures the problem.
Parts I've replaced:
OE Dump Valve (for a forge recirc)
Anyone got any ideas?