I have searched and did not exactly find what I was looking for.

My cold start vacuum reading is at around 16-17, but after a few minutes it's at 21-22. When I drive and let go of the throttle, the vacuum goes to 25.

Are these numbers normal? If so, what is the reason for this?
Thank you.

yea thats pretty normal.. the -25 in/hg is during load right , on decelleration?

From today:

Cold start: no lower than 16
Idle after driving: 19-20
Decelleration: 22-24

What should they be when cruising around/part throttle, etc? I thin when cruising around, I've seen anything from 12-20 (mostly around 16.) How much does the cold affect vacuum? None, perhaps a little (which would account for my 19in/hg instead of a solid 20 like in summer time), or a lot?

Thats normal.

yea thats pretty normal.. the -25 in/hg is during load right , on decelleration?


Yeah, the 25 in/hg is during deceleration.
If this is all normal, then thanks a lot guys.

yes all of that is normal. decelleration is going to be anywhere from 20-25 in/hg.