Hi, I've got a 91 Digifant, I notice in the mornings after warming up the for about 5mins and I begin to take off, my car shutters violently when accelerating. It only appears when left out cold at night maybe -40F. any ideas? When I had my car run through the VAG tool, it reports no signal from the throttle sensor. Would the throttle sensor be the MAF? any help would be great.