Mazda 6 Service Manual: No.25 engine stalls when driving at slow speeds or stopping

No.24 engine stalls when shifted to d, s, l ranges, or in r position

No.26 starter does not work

Other materials:

Mazda 6 Service Manual: Intermittent concern troubleshooting
  Vibration Method 1. If malfunction occurs or becomes worse while driving on a rough road or when engine is vibrating, perform the steps below. Note There are several reasons vehicle or engine vibration could cause an electrical malfunction. Some of the things to check for are: ...

Mazda 6 Service Manual: Hold switch inspection
Operating Inspection 1. Turn the ignition switch to ON (engine OFF). 2. Verify that the HOLD indicator light is not illuminated. Depress the HOLD switch and verify that the HOLD indicator light illuminates. If not as specified, inspect the terminal voltage of the HOLD switch. Voltage Insp ...