HELP! Random Engine Cut-Off!!!

[YarisPR]

This happens to me randomly. I'm topping the MPH (90mph) and RPM (6500) in 3rd gear, when I put 4th gear the car does this things:

1. You hear the same "bbbrrrrrrrr" sound of a paintball gun that ran out of gas (CO2). And then a complete engine silence.

2. The throttle doesn't respond. If step on it nothing happens at all

3. The CEL light starts blinking (Its alway on because of the Corolla TB, I've scan it and the Cel is because of the TB).

4. After like 30 seconds the throttle starts to respond but only if press lightly. If you go full throttle the car starts to "missfire" and stars making the same "bbbbrrrrrr" sound I said bafore.

5. Then the CEL stops blinking and the car goes back to normal.

Mods:
-Custom CAI
-Header
-Corolla TB
-2" Custom Exhaust (only 1 cat) with a generic 2" muffler.
-Underdrive crank pulley

Any help, ideas, explainations would be gladly accepted