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?
