My Honda Jazz/Fit 2005 GD3 1.5L manual with the L15A engine. It currently has approximately 175,000km on the clock. I am using Nulon full synthetic 5W-30. However it is vibrating (warmed
up) when at idle. If I give it a bit of gas then it smooths out
I have changed the spark plugs about 1500km ago and 4 GOSS coil plugs about 500km ago.
Also the valves were adjusted as they were tight which has helped slightly however I can still feel it. The EGR valve has been replaced also with a brand new one.
The 4 engine mounts have also been replaced ( LH transmission, LH torque mount, Rear transmission and RH).
What can be the cause of this?

Thanks