Issue is back and seems to be getting worse with the cold weather....
Now I’m back to thinking it’s an issue on cylinder 8 specifically.
Quick re-fresh, I have an awful miss around 2500-3000rpm it starts around 2000 rpm and feels like a slight surge then around 2500 it starts getting shakey and feeling rough.
Compression test on cylinder 8 revealed 155psi.
I removed the valve cover and couldn’t see anything odd with the valve springs on cylinder 8 but I’m convinced it’s an issue on cylinder 8.
Is there a way to diagnose a valve spring issue on a specific cylinder?