i have just bought a zafira 2001 dti, there was a lack of acceleration up to 2-5 rpm, then it takes off, i felt that i was putting my foot down further than i should be, the car runs great once i am moving, cruises at 70 & put your foot down accelerates no prob, a engine control speed sensor has been mentioned, saying car isnt getting the right amount of fuel at low revs, is this so? could it be anything else? agr valve? is this a easy fix? i dont know where to start thanks ROB