FA,
In my opinion engines only miss a beat for a reason.
The engine in our Robin had a sticky valve (unbeknown to me) which led to a valvestem failure, piston damage and some excitement and grey hairs. It had 75 hours since overhaul at the time.
How far you investigate any abberant engine behaviour depends on how narrow or thick your comfort zone is.
Unlikely to be an ignition problem and obviously with the system being injected you can forget the carb ice theory!
HTH, but let me know if you want to have a further chat.
FD
Have a look
here if you think that engine failures only happen in hight time aeroplanes and engines