Does this mean the AOS is toast?

[kk2002s]

First level of no tool testing is while car is running see how hard is it to remove oil filler cap. More specifically you need a tool to measure vacuum and compare the results with the expected. Search and you will find references to the tool and the nominal values expected

[Fluellen]

Thank you for your replies.

The car does not exhibit any of the other signs of a failed AOS, so I decided to just clean the TB for now and put everything back together. The idle is very steady now, so I’ll declare victory at this point.

Thanks again!