Hi Juan,
One thing you'll want to look at is that opening on the left side
More than likely that is the idle air pathway.
You'll want to restrict that down to a 1/8" - 3/16" pathway and you'll
want to reroute it up towards the plate shaft.
You'll want to make sure there is enough gasket in that area to cover the reroute.
The rpm surge typically occurs with the computer controlled (fly by wire) throttlebody's
Pretty sure yours has a cable for the accellerator.
I wouldn't worry about a regroove until you've made the other adjustments, it may not be needed.
Welcome aboard
Karl Fortner
Tacoma, Washington