Running about in the car today and I noticed at around 5k in third it cut the ignition very briefly as if it was over boosting with no chip, I pulled pipe off actuator and it ran well over 15 very briefly so I know the ecu is chipped.

It only done it 2 or 3 times today but I've shat myself every time! Could it be the coil breaking down? Am I worth going for the group A coil? Is it worth the cash?

Any help appreciated, Paul