I have a rough idle, slightly sluggish throtle response, but no stalling ever...
I'm thinking vac leak.Vac guage reacts as follows:
measured at T in back of plenium, at idle, is rock solid 18hg.
My question is, other than idle=18hg, what readings should I get at other throtle positions.

 

theres to many factors to just say u shoudl have x amoutn of vacum at 50% throttle ext, engine load/speed etc all play a part

 

Mine reads 18 also (AutoMeter boost/vac guage), but goes all over the place depending on where the butterfly is positioned.

 

take a propane bottle and pas it over all the vacuum lines, if theres a leak you rpm's will go up.