Rear engine power loss during flight

[Jhogan0101]

Tim, i also fly a 337B! SN 661!
I know you just spent a bunch of money but i would invest in an engine monitor.
I have a jpi edm 790.
I would not fly without it.
Its really helped me manage my flying and also identify problems on runup (usually a fouled plug)
It might also be a good idea to put gauges on your fuel system.
You want to measure metered and unmetered fuel.
You will need this continental adaptor. Continental Tee MS 51523B4
Attached is a chart showing what the numbers should be.
Third row down
https://ibb.co/VL1kXN5