you really won't completely benefit from the plenum/tb until you put forced induction. you also don't really need to that upgrade until then or if you have done some lower intake and cylinder head work. the only way to get your car to idle better is to get the maf upgraded, i am not too familiar with the maf, so i am not sure if you can get the stock one re-burnt to match your new intake and t/b. i would call a local shop to ask, or you can through www.murillomotorsports.com and they have a forum where you can ask general questions and you will get a pretty good response on how to correct problem.

 

That doesn't sound normal for it to stay at 2500 RPM's. I don't have the Accufab T/B and Plenum combo, I just have the accufab TB and C&L Plenum and mine doesn't do that. Isn't it loud? So say you stop at a stop light and it will just stay reved? People around you are probably like what's with that guy? LOL I don't know what the problem could be, but I would get it checked

 

Sounds to me like the TPS isn't on the TB right.

 

Hahaahha, Thats exactly what my old Eclipse used to do, check you IAC maybe?