My ax can't go over 2000 rpm when on the move so it strugles to go up hills and picks up speed very slowly. When on stand still i can rev the car like normal the problem is only when the car is moving. I changed the coil pack a couple of months ago because the car wouldn't fire up at all so not sure if the problem could be the coil pack again. The only thing i've changed so far is the spark plugs but no luck. One other thing i've noticed is that the the car is drinking slightly more petrol than normal. Any ideas and help would be much apreciated. Thanks.