i have a 02 wrx thats stock. my problem is under wot it hits peek boost then drops boost then repeats that trough the whole rpm range about 4-10 times depending on gear.i dont have any boost leaks and no trouble code in the pcm. if i bypas the boost solenoid and just run wastegate boost its fine and pulls smooth. could it be my boost solenoid or the pcm making the boost go high low high low......