/6 tanks when in gear

Click on the little blue M at the bottom of my post

The vacuum canister is a controlled vacuum leak, routed through various controls so it usually does not function at idle.
The PCV is a full-time controlled vacuum leak. It is a continuous leak and is self adjusting.
There is a valve in the air filter house hooked up to vacuum; and it too is a controlled vacuum leak,full time..
The choke pull-off is supposed to be sealed. The diaphragms are known to rupture and this then becomes a vacuum leak,at idle.
If you have A/C there will be a vacuum tap to operate the controls. If this goes bad, there will be a non-engineered vacuum leak,out of control, and continuous.
If the EGR has been defeated, this won't or shouldn't affect the idle;unless it was incorrectly defeated.
The vacuum advance is supposed to be sealed and non-operative at idle. If someone hooked it up wrong and reset the idle timing, you will have nothing but grief.If the diaphragm has ruptured it will be a timed vacuum leak.