I have a 2005 g6 GT with the 3.5L V6. It has about 88K on it. I was driving home for lunch today and when I pulled in the driveway and it started idling really rough jumping inbetween 600 and 900 RPM. I turned it off and went inside for about an hour. When I came back out to start it up it was slow to start up and was still doing the rough idle. I opened the hood to see if I could see or hear anything. I listened on the accesory side and everything sounded normal but when I went over to the other side of the engine I heard a prshhh sound coming from the area where the throttle body meets the intake manifold. There is a little cylinder looking thing in this area with some sort of hose coming off it and it actually sounds like it is coming from there. I shut it off and tried to restart it and it did not want to start until I pushed the gas pedal a couple of times and still ran rough. Also there are no warning lights coming on. I just parked it in the garage and took the other car which eats much more gas!!!. Please someone help me or steer me in the right direction!!! Thanks.