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Hissing noise at the Firewall

darkfox1009

New member
Hey everyone, I'm brand new here at GP Forums, and especially brand new to my 1998 Pontiac Grand Prix GTP 3.8L Supercharged. So I first off wanted to say Hi!

Secondly, I am very new to the lingo, and acronyms so maybe if I could get some nooblet help from all the awesome people here that would be great!

Ok, so my car is running rough at idle, and it starts just fine, I replaced the MAF (I know that one lol) Sensor, plugs and wires, and the distributor coil pack. I was checking for leaks and I heard a hissing coming from what I assume is the brake booster? (sorry if that's the incorrect term) Basically the Black bubble shaped device at the firewall lol I would love some help. I apologize for the noobiness lol and thank you all for the help in advance!

P.S. I don't know if this helps, but I will leave the car running for just a little bit, then turn it off and it is hissing from that area. Almost like how a turbo timer would cool down?
 
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