I was having a bouncy idle at around 500-700, causing the car to jerk alot, so I adjusted the TPS, and i got a solid idle at around 1200, how do i lower it back down to 800 without touching the tps?

 

Jumper the Initial Set Coupler and adjust the idle adjust screw on top of the throttle body. If your car is an S4 then you can adjust the Variable resistor as well. After making the adjustments you want to recheck the TPS.

 

download the fsm at foxed.ca it will tell you exacly how to do it.

 

Those two adjustments are for IDLE MIX and do nothing to address the true idle speed.

 

what engine is it? What series? turbo or nonturbo? USDM or JDM?

 

And fix those vacuum leaks.