A quick service, into disaster!

[scottdm]

I read the TSB again and it does seem very vague and possibly interpreted different ways depending on the tech. I wouldn't worry too much about the vacuum lines being capped and the IWE's engaged all the time. The difference in fuel economy would be negligible.

When the IWEs are engaged, it causes more driveline noise as well, so I'd want it to function as designed. I rarely run in 4A for this reason since 2H is much quieter in my experience.