I have an 07 mazda 6 which recently started rough idling and stalling. In certain gears (automatic) the car is so bad it bounces. Rpms are below 1000, constant mis when driving. We have replaced a fuel injector, the o rings on the injectors, the valve cover gaskets, intake gaskets, cleaned throttle body, replaced pcv hose, spark plugs, ignition coils..... anyone can help??? Want to fix myself before taking it to mechanic. I can get a video of what its doing if needed.