I'm having this issue with power loss on both engines, several times during a flight with the C404 in P3D v3.4. It seems like the manifold pressures drop slowly back to almost idle for what seems like a lengthy period of time. I have Pitot heat on, fuel pump on, mixtures back up to rich and it will eventually regain power. I've looked at P3D's failure settings and nothing is selected. I do have the "engine stress damages engine" checked under Realism but since it comes back, I wouldn't think this is a issue. Has anyone else experienced this?

I've had the same issue with FSX. I thought it was the 'carburetor heat' modeling issue, so I hit the H key, but without immediate change. I do have the 'Real Engine 1.4' program but I don't think that's the cause. I did slightly modify the CHT in the .air file, but that's it.

 

I hope someone can help us.