Engine/Drivetrain Vibration Issues

[apardal]

The rattling is heard on all gears.

About the fuel cut, my AFR only measures between 10 and 16, above 16 it will show "Air", and that's what I read on decelerating off throttle.

Yesterday I went to a friend mechanic and he jacked my right rear wheel and asked me to gear the car and start rolling until I reach 3000 rpm to listen underneath the car. We could hear the rattling but couldn't really say where it came from. He told me it might be unbalanced flywheel, but he gave me a good way to find out.

He told me to disconnect the driveshaft (after the center bearing) and start the engine throughout the gears to look for rattles. If there are none, it most likely comes from the rear end. If there are, then it can come from the flywheel or the crank bearings that I installed wrong.

Best regards