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: Inspecting Electrolyte Level
A low level of electrolyte fluid will cause the battery to discharge quickly. Inspect the electrolyte level at least once a week. If it is low, remove the caps and add enough distilled water to bring the level between the upper and lower level (illustration). Do not overfill. Examine the sp ...

Mazda 6 Service Manual: Schedule 2
    Chart symbols:   I : Inspect: Inspect and clean, repair, adjust, fill up, or replace if necessary. R : Replace L : Lubricate C : Clean T : Tighten Remarks:   *1 Use of FL-22 is recommended when replacing engine coolant. Using engine coolant other than FL ...