I have an 2002 Audi A4 B6 with 1.6 ALZ engine -When i accelerate and let the tachometer needle does not return but fail to stabilize at 900 rpm to 5-600 rpm would like to die. I changed the fuel filter, air filter, spark plugs, temperature sensor. Does anyone know what is? HELP!

PLEASE TELL ME WHAT IS THE PROBLEM ? NO MECHANIC FROM MY COUNTRY KNOW WHATS THE PROBLEM !!!!

DOWN YOU CAN SEE THE VIDEO UPLOAD TO YOUTUBE : THANX

Audi a4 b6 idle problem - YouTube