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: To Increase Cruising Speed
Follow either of these procedures. To increase speed using cruise control switch Press the RESUME/ switch and hold it. Your vehicle will accelerate. Release the switch at the desired speed. Press the RESUME/ switch and release it immediately to adjust the preset speed. Multiple operations wil ...

Mazda 6 Service Manual: Fuel injector removal/installation
Caution Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting using a cloth or soft brush, and make sure that it ...