Xcelorine S Problem ! Glitching

[dayxwalker]

Had this combo for about 2 month no problems ! Just put it in my B44 and all of a sudden it is glitching at low throttle it's ok when you are thrashing it but when you try and go slow it is very glitchy to the point that it sometimes sticks and stops and you have to give it a push. Tried new sensor wire no joy and just loaded latest software (v2) to my vista pc and updated the firmware to 1.1.28 and no joy ! Checked wires are the right way round ! There's no loss of top end and power it's a rocket ship (4.5). Gutted as I really like the combo it was so smooth better than my GTB

Anyone any suggestions ?