Just got a little 5dr 5 speed a couple days ago thats fun to drive...above 2500 rpm. I have no CEL but when accelerating from a stop, its really slow and sluggish but right when it hits 2500 exactly, its like the boost kicks in or somethings and it takes off. If you shift into the next gear and the starting RPM for that next gear is bellow 2500 then the car will bog down and then take off again once it reaches 2500. If when you shift into the next gear, your starting RPM for that next gear is like 2600+ then there is no hesitation in acceleration and everything is smooth. Someone told me to reset the ECU so I just went out and unhooked the negative and I'll hook it back up in the morning.