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: Operating Tips for MP3
MP3 stands for MPEG Audio Layer 3, which is standardized voice compression established by the ISO*1 working group (MPEG). Use of MP3 allows for audio data to be compressed to approximately a tenth of the source data size. This unit plays files with the extension (.mp3) as MP3 files. *1 Intern ...

Mazda 6 Service Manual: Vehicle speedometer sensor (vss) inspection
Visual Inspection 1. Remove the VSS. (See VEHICLE SPEEDOMETER SENSOR (VSS) REMOVAL/INSTALLATION.) 2. Make sure that the sensor is free of any metallic shavings or particles. If any are found on the sensor, clean them off. 3. Install the VSS. (See VEHICLE SPEEDOMETER SENSOR (VSS) REMOVAL ...