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: Rear door speaker removal/installation
1. Disconnect the negative battery cable. 2. Remove the rear door trim. 3. Remove in the order indicated in the table. 4. Install in the reverse order of removal. Rear Door Speaker Installation Note Attach the speaker with the wiring harness placed in the groove of the door unit panel. ...

Mazda 6 Service Manual: Technical data
ENGINE LUBRICATION SYSTEM Note The maintenance intervals on scheduled maintenance table (See SCHEDULED MAINTENANCE TABLE) can only be supported by the use of following oils. Recommended engine oil COOLING SYSTEM FUEL AND EMISSION CONTROL SYSTEMS ENGINE ELECTRICAL SYSTEM ...