P0175 only & MAP=6 in-Hg @ Idle w/heads, cam, headers 511 rwhp: Vacuum Leak?

[Tom and Vipers]

Trying to get a specific answer to "Does it sound like a Vacuum Leak?"

This is part of a much larger problem for which I have a thread "...High Idle... High Altitude..."

Specifically listing codes in title may attract more Wizards I'm hoping.

 

[whatthe]

I had an intake manifold leak that I could not detect with a can of carb cleaner. I finally took it to a shop that used a smoke machine, the leak showed immediately. The symptoms I had were a hunting idle and rpm's sticking at 1200 rpm when letting off the gas. It might be worth the smoke test cost to eliminate a potential cause.

 

[Dan Cragin]

Happy to help, I deal with tuning issues all the time and have done more cam and head changes than I can remember. With some more info, I'm sure we can figure it out. 310-597-6295.