and i hear a hissing noise comming from somewhere under the hood when its idling, sounds like air.... but cant find where its leaking from
he doesnt even need that matt, if he can hear it at idle, then he can just let the car idle and spray soap and water and look for bubbles lol. same thing as using that ic tester, u pressurize the system and spray soap and water to try and find ur leak...but in his case its leaking at idle...so he can skip that step, unless he cant find his problem then ignor what i just said and BOOST LEAK TEST