engineerjle
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I have a 2005 Sunfire that I recently bought. It is running rough (missing) and the check engine light is on. The codes returned are P0507 (Idle Speed High) and p0300 (engine misfire). I replaced the plugs on the off chance that would fix it (the car needed them anyway), but it continues. I assume it is a vacuum leak, and I have identified a port on the upper intake manifold that is sucking air with the engine on. I am fairly certain this is the vacuum leak. I don't see any tubes/hoses hanging to indicate what is supposed to be connected to, nor can I find a picture or any reference to what the port is for or a diagram of the vacuum system. I attached a picture with an arrow pointing to the port I am talking about. It is right below the throtle control. Please, if you know where this port is supposed to go, reply.
