Air/ fuel tuning

also i'd like to add.
idle neutral we have 1500rpm 11" vacuum best
then in gear i get maybe 1100 with 7" vacuum
that left me with 13.7 neutral and then maybe 14.1 gear

i realise most people here said dont get too caught up with tuning the idle.
thought best place to start would be at least get this right.

biggest trouble i have is my electric fans .
engine heats up as temp changes so do vacuum, afr, and rpm.
then as fans come on at 195 and starts to cool over a 30 second period , all the reading are altered.
lower vaccuum lower rpm.
down to 175 then until it creaps up , i try to get my readings with fans off and on the way up from 180 through 190.

i ended up today with 1 full turn out and a touch . seemed to give best vaccuum and rpm. not a big difference but everyone seemed to prefer a touch richer idle .


can anyone tell me anything you can look for with spark plugs when driving on street and just using pump gas.
a lot of people say too hard to read anything