Mazda 6 Service Manual: No.11 engine stalls/quits, engine runs rough, misses, buck/jerk, hesitation/stumble, surges

No.10 low idle/stalls during deceleration

No.12 lack/loss of power-acceleration/cruise

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: Liftgate disassembly/assembly
1. Disconnect the negative battery cable. 2. Remove the liftgate lower trim. 3. To remove the liftgate outer handle and liftgate key cylinder, remove the rear finisher. 4. To remove the stud ball, separate the stud ball and the stay damper. 5. Disassemble in the order indicated in the table. ...