I recently had my CEL come on, pulled the codes and shut the light off. The two codes that I read were a P0491 Secondary Air Injection System bank 1 , and a P0302 Cylinder 2 misfire. Sometimes the light will stay off for a few days, other times it comes back on right away. I replaced plugs, wires and the coilpack thinking that would remedy the misfire code with no luck. Where would I start for fixing the air injection pump. I believe the pump is located on the front of the block down low under the intake. Start the car and see if I can "feel" the pump running with my hand?

2005 Sebring Sedan 4cyl 118k miles