My 04 Xfire stalls and dies at stop lights and sometimes stall at high rates of speed, It always fires right back up and runs smoothly until the next stop. If I shift into neutral at the stop the engine won't stall, but it always falters just a little when I began to accelerate. It has 90k on it. I changed the CPS but no luck, the CEL is on but it's been on before this showing "secondary air injection malfunction" any thoughts?