Okay, the car has a 65mm TB. C&L intake tube with K&N filter. O/R H pipe with flows. A diablo tune and 92 octane.

See, what happens is when I (very quickly) tap on the accelerator, the engine will seemingly hesitate. This video is of course sitting still at an idle. I have excellent throttle response otherwise, but I will tell you that when accelerating through the gears, while switching from second to third, the engine will somewhat hesitate. Not enough to notice, in acceleration but enough to audibly notice. Let's see if I can explain this through text... Okay so the following text will represent accelerating through third gear.

BAAAAAAAAAAAAAAAAAAAuuhhhhBAAAAAAAAAAAAA_____BAAAA AAAAAAAA.

So from first to second you can audibly hear the engine's drop in RPM but from second to third there is almost a moment of silence. It's very interesting.

Other than those two things, there are no issues whatsoever. Here is a link to a vid of the idle.

http://www.youtube.com/watch?v=PrD3mMhbTn4


What do you suppose is causing this?

 

It could be several things. From time to time I have a similiar drop and kick when tapping the gas. I'm speculating that I could have a plug or coil going out, after all, they probably are the originals and I'm over 108K. It could be that for you, it could be something else.