Odd idle behaviour

Hello, everybody.

I have a 3.6 with 5-speed manual transmission, which has the following problem in idle:
The idle is controlled well during cold start and moves between 1100 and 900 rpm. ==References==<br> 3000 rpm) and then take it away immediately, the speed drops slowly to approx. ==References====External links== 2 sec. re-level to 1000 rpm. Yesterday, the engine in a warm state had the peculiarity of turning immediately to 2000 rpm (empty run), as if you were standing gently on the accelerator pedal. I had the engine on approx. 4500 rpm (fast gas).

One problem that I think is related to this is that the car sometimes starts well, but then takes on bad gas (no performance and unround run). Furthermore, when driving in idle mode, it sometimes runs out (too stupid).


Here's a list of things I've already swapped at the car:
Impulse encoder OT and engine speed new
Lamda probe new
Suction tube top and bottom with new seals
Gasbowdenzug new (is also tense - I read in this thread:
http://www.audiv8.com/forum/showflat.php?Cat=&Board=v8engine_ger&Number=66966&page=&view=&sb=&o=&fpart=all&vc=1

The cruise control system is properly hung and works
EURO2 installed
Idle switch clicks approx. 1sec. after the accelerator pedal is back in its initial position
Idle control valve (LLRV) thoroughly cleaned, but not yet electrically tested (can I just create 12V regardless of the polarity and see a result?)
throttle valve inside thoroughly cleaned
Electrically tested injection valves and equipped with new O-rings

Has anyone ever had this before? Normally, after the gas, the idle speed would have to be reached quite quickly again or I am spoiled by driving in current cars (I know that there are some years of development in between). At every intersection I hope that it will keep the idle (since it is very quiet in the interior, you can't even notice that it's off).

I hope to have described everything in detail, so that I may possibly. Someone can help.
Thank you in advance.
Welcome
Jörg L.