2010 WRX CEL causes

[Hawlass]

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!

[Calvinball]

Very tough to help without the codes.

One apparently common issue with the newer gen cars, though, is that the hoses connecting to the intercooler can come loose under heavy load. Problem is while the car is sitting it may look fine.

[Mikie13]

Overboosting/fuel cut perhaps? Going WOT in 5th gear is heavy engine load...