What can be done to increase the vacuum presure on a 350 TPI
engine (not stock)?? Engine is stalling with the A/C on and also in slow traffic. Otherwise runs great with the A/C off and no load.

 

vacuum and preasure are two differant things. if your vacuum is low you ought to be looking for a leak. if you have driveability problems you ought to trouble shoot it a little and make sure your tune up is good and that there are no codes stored.

 

No leaks in vaqcuum lines and no codes, engine is tuned. Question was how to increase vacuum presure, I am using a cam with a 110 ls? Thanks

 

oh ok i thought you had a driveability problem. vacuum pump would do it, but that's a pretty drastic move. change in timing or af mixture would change it, but i doubt if it'd be much.