ok my cars idle is jumping from 1200 to 1500. I took the intake off today and my question is? should the secondary butterflies be closed when not on the throttle? If they are open a little would this cause my idle problem? ow and its a 90 s5 turbo. thank you, Justin

 

you need a service manual and it will tell you the clearances for the TB, but your jumpy idle most likely is caused by the throttle sensor needing adjustment. Do a search for tps adjustments and you will find many ways to do it.

 

i already set my tps and checked it about six times.

 

than you need to look in the FSM for the clearances and make sure they are set correctly.