2002 wrx wagon stock: i had a misfire in cyl. 1, and the car was running poorly (real rough idle etc.) so i replaced the spark plugs and coil pack . it didnt do anything so i bought a new MAF now it idles good and drives somewhat smooth. However when i put the pedal to the floor the acceleration is on and off until around 4000 rpms then it stops pulling hard all together and the check engine light comes on (blinking), then shuts off when i go back to reg. driving. i can hear the turbo so thought maybe its a leak . or is the turbo fried?