Mazda 6 Service Manual: No.7 slow return to idle

No.6 cranks normally but will not start

No.8 engine runs rough/rolling idle

Other materials:

Mazda 6 Service Manual: Rocking the Vehicle
WARNING Do not spin the wheels at more than 56 km/h (35 mph), and do not allow anyone to stand behind a wheel when pushing the vehicle: When the vehicle is stuck, spinning the wheels at high speed is dangerous. The spinning tire could overheat and explode. This could cause serious injuries. ...

Mazda 6 Service Manual: Maintenance Monitor
The following maintenance period notifications can be displayed by turning the Maintenance Monitor on. Scheduled Maintenance Tire Rotation Oil Change For the setting method and indications for the maintenance monitor, refer to the Maintenance Monitor. The maintenance monitor displays ...