Boost Problems...
 

i just got my vaccum lines tied down and my boost holds a perfect 10 lbs. My problem now is third gear @ 6700 rpm my car hesitates and boost drops to 8 lbs for split second then goes back to normal. This doesnt happen in 1st or 2nd but third gear and higher is happens. And its constantly there so is there any guys that can help a newbie like me? thanks