I installed the RPS carbon in my Z this past summer. I drove it easy around town for over 100 mi and decided to try it out, and it slipped pretty bad. It took another two weeks of daily driving and getting stuck in 2hrs of 1st gear traffic over the George washington bridge to finally bread it in, LOL! Also, it had quite a chatter for a while until I raced it (six passes) and then it engaged nice and smooth. Funny, but I guess it needed some initial abuse to really break it in. Hope you sort out the idle problem, keep us informed!
Best ET 12.66 at 113mph & 2.0 60' (on bald street tires) Best Dyno 339 hp & 384 tq