Q: Rear bank of cylinders has no spark.

Hello. A no spark condition can be caused by a wide variety of issues. If the issues appear to be affecting an entire bank, that is an entire side of the engine, then it may be possible that there is some sort of electrical wiring fault. This particular model of vehicle uses individual ignition coils for each cylinder. I would carefully inspect the wiring harnesses to each affected cylinder to see if any of them show any signs of damage or wear. If the wiring looks good, then a few other things I would look into are the cam and crankshaft position sensors, and possibly the engine computer. The ignition system is triggered by these three components, and any faults with them can result in ignition system malfunctions. If you are unsure I would recommend having a professional technician, such as one from YourMechanic, come to your location to diagnose the cause of your performance issues.