I have a 2007 saturn aura xr 3.6L. When the car is hot after being drivin making a few stops and starts it will feel to me like it has no power like its in 5th when it should be in 2nd gear. Then if I go to climb a ramp or pass someone it'll hesitate/cut out and when I give it gas it will buck or shift hard. Theres no misfires no codes no engine light. Replaced the plugs and two cam position sensors and the mass air flow sensor. Nothing changed. Transmission, fuel pressure(not while driving) all checked ok. Please help!