Call from the GM dealership today? They are puzzled they say the engine is running with the throttle closed, YUP I told them that, and that it runs without any throttle body at all. They wonder where it is getting its air with the throttle closed. So is there a real difference in the aveo heads beyond the different intake manifolds?? Mine is simply supposedly from a 2005 wave and a 2005 aveo. I know the head is new to the engine, but the intake manifold was on the engine before the idler failed and tore up all 16 valves. ANY SUGGESTIONS OUT THERE IN AVEO LAND?? THANKS Rocky