High vac reading.....

[gsxrtalon]

I have noticed that my vac reading at idle is staying at -23 to -23.8 or so and my idle is at 700-900rpms. Is my vac reading really high? Isnt it supposed to be -19? Sometimes Ill start my car recently and it will fire right up then after a minute the idle will drop real low and it will die, once the car runs for a couple minutes or so the idle is fine. Any thoughts as to why my car does this. ISC? TPS? Plugs?

 

[TSi Fury]

If you think your low idle is causing it, then adjust the BISS screw and turn your idle up some.

 

[gst25401]

I am having the same problem with vac. mine reads 29@ 800rpm! high right ? When you find out what causes yours let me know. No trouble with stalling though, thank god. Good luck man.