IAB spacer
 

I installed one of these has anyone else using it. On inital start ups before adjusting it it would idle at 1400 then drop to 900 which reminded me of a few posts that people have made with this problem. Once I adjusted it, it seems to work fine being the guy who had the car before me put a big cam in it. you can adjust the idle through the spacer plate ( the amout of air)to smooth it out.