Idle Surge and BOV open at idle

[BoostedTT91]

i have a freshly rebuilt non turbo throttle body from Steve at Throttlebodies.com with a FIAV blockoff plate and im getting idle surge pretty bad all of a sudden now. Since i dont have the ISC or FIAV, what else could be a cure for this?
Also when the car is at idle my Tial BOV is about 1/4 of the way open, why would it be open at idle?

 

[nightracer91]

A BOV opens with vacuum, an idling engine is running in vacuum thus opening the valve some. With the surge, check for any boost/vacuum leaks. Anything from a cracked PCV hose to a rotted lower injector seal will cause the engine to rev up then kill at it's 1500 rpm threshold.

 

[BoostedTT91]

it was just the idle switch was adjusted down to far which had the throttle plate open to much causing the idle surge. once i adjusted it out more it stopped

 

[illeffekt vr-4]

Are you venting the Tial? Did you set the TPS, and BISS screw properly?

 

[Hiitman]

Did you set the TPS, and BISS screw properly

Will setting the TPS and BISS screw propperly help with the open bov at idle?