If the 4E engine is engaged in a gear and then turned off, there are a few potential issues that could arise.

Firstly, if the engine is turned off while the vehicle is in gear, it can put strain on the transmission and clutch components. This strain can cause premature wear and failure of these parts over time. It is generally recommended to always disengage the gear and put the vehicle in neutral before turning off the engine to avoid these issues.

Secondly, if the engine stalls while in gear and then is unable to start again, it could indicate a problem with the starting system, such as a faulty starter motor or a weak battery. In this case, it would be necessary to troubleshoot the starting system to identify and address the specific issue.

Lastly, if the engine can be restarted after stalling with the vehicle in gear, it could indicate a problem with the engine itself, such as a fuel delivery issue or an ignition system problem. Inspecting and troubleshooting these systems may be necessary to determine the exact cause of the stalling.

In any case, it is always best to consult with a professional mechanic to accurately diagnose and address any issues related to engine stalling while in gear. They will have the expertise and necessary tools to properly diagnose and fix the problem.