Normally when you have a bad coil, you will get misfires but eventually, the DME will shut down the injectors. With no gas coming from the injector(s) you can feel the misfire. A misfire to the computer is when a cylinder(s) don't provide the same power when the spark plug is ignited. The computer can determine this by the crank rotation speed (RPM) if the cylinder is as strong as the other cylinders. Most people think of a misfire as a bad coil or bad plug, but a bad injector can also cause a misfire or a cylinder with low compression can also attribute to a misfire.

E4 Fuel trim bank 2, permissible range exceeded
E3 Fuel trim bank 1, permissible range exceeded

It will be helpful if we knew which range the sensor was reporting, either too lean or too rich.

As for the MAF of 21kg/hour which means dilly to me since I'm more used to g/s that converts to 5.8333 g/s which kind of high for an airflow at idle. Airflow through a MAF is used to cool a hot wire or hot film and the DME can determine this base on the current required to heat up the hot wire or hot film.

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