I have very recently completed my NA build, and I am curious to why when I push in the clutch and the car goes to idle after acceleration that it will go to the proper idle, and then it will dip about 500 rpm and bounce back up (if the car doesn't stall) The current idle is set at 900 rpms and I have JWT C8 cams (272's)

 

poor MAF tuning most likely

 

mine dips when i start it up could this be a maf issue aswell?

 

OP what are you using to tune with, I know that with my old Utech my car used to do the same thing and it was because the ECU couldnt keep up with the car and it would run pig rich until the ECU figured out that I wasnt on the gas anymore...

 

rough idle as well?
vacuum leak. or air leak near intake tubing.

 

It idles fine. It is going to be kinda lopey because of the cams, but runs and idles fine. I was dyno tuned at uprev in austin. It is also really hard to start back up after it stalls.

 

Also, It was hooked up to a smoke machine on the intake manifold and to the intake pipe, no smoke is blowing, so vacuum is good

 

With everything that you've said so far it still sounds to me that your ECU isnt sensing that your off the throtle and briefly continues to dump fuel...