[Jamesp]

Bank 1 and Bank 2 too lean

Installed a new AOS during the rebuild as there was oil in the intake tubes

Took the oil filler cap off at idle and there was a little vacuum in the crankcase. 2 fingers and little effort maybe three or four ounces of force to get the cap off, as it was definitely getting pulled by a vacuum when it was removed and installed.

I searched this forum and believe I am looking for a fairly substantial vacuum leak.

Anyone have experience with this?