when i set off in 1st the car will bog at low revs between 1000-1500 then it will shoot off and when it hits 3000rpm it will cut off completely to make me nearly smash my face on the steering wheel. Ive only got the throttle pressed say 30% but it wouldnt even go that fast normally if i had 100% throttle. It doesnt do it in any other gears also. Ive scanned for faults and theres absoloutly nothing. Any ideas because it makes me look like a right tool setting off and kangarooing.