1998 Chrysler Sebring 2.5l V6?

Recently I was changing my spark plugs, which details.. removing the intake manifold. I took off everything but the Throttle cables which wasn't that needed. But as I turned the Intake manifold to the drivers side where the Brake reservoir is on the drivers side I heard a hissing sound like something was pulled away almost like a vacuum hose perhaps.

When I stop somewhere randomly and turn it off then when leaving it will die when I go to crank it up. I don't think this is a fuel line issue but not sure it only started happening after i heard the hissing from the driver side but just not sure what would cause this. revving it up or pressing the gas and putting it in drive will make it stay on sometimes but my car does rev higher now so not sure.