When I'm driving my girlfriends CX-7 I noticed like a hesitation when I'm at about 60 or 70 mph on the highway. It happens when I'm holding the gas pedal to stay at one of those speeds. Its almost like your driving on a bad piece of road combined with like a spark plug not firing correctly. Has anyone experienced this. She uses 93 octane and we went in for that initial check that they have all the CX-7 do.