Engine Idle Problem, Not like any posted before. Options

[Kadett]

I got this very strange problem. Car already been to the garage 3 times(toyota dealer). Still i have this problem (at least with a warm engine)

It started out like this:
1 day i started the engine (cold) and it would idle at about 1100 RPM(when i bought the car, it was 1500-1700 i think) . When i increase the throttle it would do that like normal but then it would go below its idle RPM (cold about 1400??) to about 400 and lower and sounded like a choking sound (to much fuel) and sometimes die on me.
When the engine is warm it would idle normal at 800rpm. And when I increase the throttle then it would go to about 3000 and let it drop it would go to 600 and then go back up to 800-900 rpm.

Theres a part already replaced (literal translation= Step engine) controls the air mixture with a cold/warm engine or something like that. Have not tested it with a complete cold engine but when i started it at the garage (engine not running for about 2-3 hours) it idled at about 1400 rpm. GREAT i said. Problem solved.

But after test driving it, it actually sometimes drops below 800 RPM again.
OOOOOOOH I am so frustrated. Plz somebody what can it be, before i push the f*&^%g car of a cliff!!!!!!

EDIT: I forgot to mention something: When the car idles at 800 and i have the lights/brake on and then turn the lights of or let go of the brake the rev go up about 50-75 rpm. Related?

This post has been edited by Kadett: Jun 7, 2005 - 10:00 AM

[Bigmeanbulldog55]

I'd be a lot happier with the 800 idiol than the 1400. That's were they are suposed to be. I've got idiol problems as well, but mine is involving the choke not wanting to stop (I think). Car idiols too high at times.