So, for the first time since fitting it I banged her up past 4500rpm...and... a momentary but quite marked hesitation, then Check Engine light flashes up....for about 2 seconds...then she took off like a scalded burnt thing that is on fire and maybe burning..... No repeat of the Check Engine light or the hesitation after that but she goes like stink now...and has a whole new engine sound... Do I need to worry?