Originally Posted by
Xfireshifting
When my 05 crossfire NA warms up, there's a rough idle.
The engine makes almost confused noises as the revs jump up and down when in neutral.
The Rpms won't drop down below 3,000 sometimes for about 30-45 sec.
There's a slight hissing noise coming from somewhere under my hood.
All that said, car still drives smooth.
Could be a number of things, of course. Could be as simple as a vacumn line disconnected or with a leak. Check all the hoses for attachment / detatchment and or leaks.