Very Rough Idle when gently pressing gas A/T 07'

[Pimped-up]

Hey Folks,

I got this nightmare problem with my car. When it gets warm (5-10Mins) it starts to idle, and from standing still, when I press gas very slightly, it get's quite for half a second and then suddenly starts up and drives like normal (800RMP to 1000RPM). But when I hit the gas a little harder, it drives normal. This car was in pretty big accident, but I got it fixed.

Here is the list of items I changed:

- Trottle body
- Iddle speed sensor
- Maf sensors
- Fuel injectors with vacuums
- Fuel Pump
- Coil Packs with Spark Plugs
- Variable Timing Control
- Electric Gas Pedal
- ECM Reset Engine Specs (At Nissan Dealer)

... Guys at dealership they don't know what to do, but they told me to leave the car there and they will troubleshoot it for 100$ an hour... (70$ for me) since I get discount there.

Please help!!!

P.S: If I buy new ECM Computer, would it help?

[Pimped-up]

Here is the promised video. The best way to show the problem is to hold the brakes and press gas slightly. At that moment you can hear a gap, and the entire car shakes. It would feel the same as if you were driving in it. After I press gas, it get quiet then RPM shoots up.

YouTube - good