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: Front door key cylinder removal/installation
1. Remove the front door unit. 2. Remove the cover, then remove the bolt. 3. For protector-equipped vehicles, pull out the protector tab from the latch and remove the protector. 4. Disconnect the rod. 5. Remove the front outer handle. 6. Turn the key cylinder in the direction indicated by ...

Mazda 6 Service Manual: Immobilizer System
The immobilizer system allows the engine to start only with a key the system recognizes. If someone attempts to start the engine with an unrecognized key, the engine will not start, thereby helping to prevent vehicle theft. If you have a problem with the immobilizer system or the key, consult ...