Yes, engines often in a training environment being moved refuelled etc.
Synch the props
Get em balanced or find an RPM that is not conducive to a first/second order vibration.
Heck if is bad shut the engine down and divert. Better to diagnose from the ground. Unless you are sure you know what the issue is and how it can be dealt with.
Observe the trends in your engine monitor if only slight, it could be nothing more than an ignition issue easily seen by trends in the EGT values.
What were you looking for?
Unlike my question about a turbocharged engine with an unexplained loss of MP, which if unexplained could very easily be a fire in the making, this one could have many subtle causes. No doubt I have missed the one you are seeking
