The car stops!!

The engine (fj20e) wont run at low rpm.. :mad:
over 2000rpm the engine are fine, but when I take my foot off the throttle
the rpm drops down and stops!! Even if its hot..
And if I holds the engine at around 1000rpm with the throttle, the rpm is not stabile!!

What could be wrong??

I finaly found out what the problem was :mrgreen:
The pipe who goes from under the throttle body was not on the right place.
It had fallen off under the intake....