So I just to my wrx back from the dealer about a week ago for the cel being on, they said it was a loose connection and cleaned the throttle. On my way to work today I was getting on the highway in 5th, stepped down to accelerate and once the boost started to hit there was some severe hesitation and bucking/jerking. Then the cel came on again. I don't have a code scanner at work, so I don't know the codes yet, but what could cause this? Hard acceleration in 1st-2nd seems ok, it's only in higher gears that this happens. Ill try to get the actual code later, but any suggestions would be helpful!