Hello, I installed a forge blow off valve, specifically this one; https://www.forgemotorsport.co.uk/Blow_Off_Valve_for_Renault_Megane_RS250265275--product--786.html The valve works fine when releasing the throttle but when I accelerate steadily I hear a hissing noise like something is sucking air in or out i dont really know, potential boost leak? Also the car doesn't want to pull in 3rd gear sometimes (only 3rd gear) like it pulls for a second then dies and then accelerates slowly. Any help would be appreciated. I fitted the valve by instructions twice and still the same thing, even replaced the uprated springs. Thanks.
