Occassionally, but not every time, as you accerearate from a stop, I hear a nosie that sounds like a rapid intermittent air release or intake. It almost sounds like a baseball card in the spokes of a bicycle wheel if you know what that sounds like. It immediately quits if you let off the accerator and it will quit by it self when the vehicle shifts gears. The sound is coming from outside the passenger compartment but can't tell exactly where. The vehicle idles alitle rough when A/C is engaged but other than that runs fine. It has new plugs and wires. Ideas on what to check?