I got an interesting one for you guys.

06 Shinka, 98,000 Miles

I recently replaced my spark plugs, coils, and leads over the weekend and everything went great. I started the car up with no problems and drove her around the block and noticed a bit more pep in the acceleration, probably from the new plugs and coils. But something was a bit odd when I put the car in neutral, She seemed to jump a bit before settling down to idle (maybe a 200-350 RPM jump). No CEL at the time...

I drove around a bit that night to let the car run a bit and while at a red light my CEL came on. I pulled over right away and pulled out the old OBDII and got the code P0507 (Idle Air Control (IAC) System RPM Higher Than Expected). I thought maybe it was simply just a vacuum leak and me being stupid forgot to plug a hose back in when I put everything back together. Thinking logically, I took the air box out, accordion, and the throttle body only to find that every hose was on good and tight. All the coil packs are snug and nothing seems to be damaged, but i'm no expert. Here is a video of what I am experiencing. All I am doing in the video is pressing the gas for a moment to demonstrate the little jump that is causing my CEL

https://www.youtube.com/watch?v=lO8z...ature=youtu.be

The weird thing is that the car has 0 problems with everything, including the idle. She will accelerate a LOT faster then before and chilling at idle is no problem either. it is only when I tap the gas, or the car is coming down to idle when I go into neutral. I don't down shift and normally just throw the car out of gear when I come to a stop light... any ideas as to what is causing this?

I found a guy on "This Page of RX8club" having a similar issue to mine, but he never seemed to get a reply from what I saw.

TL;DR
I replaced spark plugs, coils, and leads. As a result of "something" my idle now jumps a little before settling down, which is causing a CEL to throw up. I have a video and OBDII Data recordings of the issue.

What have I done so far to attempt to fix the issue?
1. traced my steps back and disassemble the Air box, take out the accordion, and inspect the throttle body.
2. Cleared the code, thinking maybe the car just needed a few cycles/runs to re-learn how to idle?
3. stomped on the brake 20 times

What else I think I can do?
Have the car relearn its idle? but how?
Are the plugs bad?
i'm almost 100% sure there is no vacuum leak anywhere
I also notice the car jumps to 3000 RPM after I turn the key, and it only used to go to 2000 - 2100 RPM with the old plugs.

any help is much appreciated. =)