BMW m20 ICV/ISV (hesitation , miss-fire) HELP!

[sindako]

Hello zoners .
See i am having a problem with my e30 being a B****
anyways , it drives normally on low RPM's but when i am on 1st or 2nd shift and i want to go fast , the car hesitates and misfire in between 2k and 4k
but on high rev's it's pretty normal , it does this sometimes even on high shifts .
The tests i made were for the fuel supply and engine electronics .
So , I tested all electronics (sensors) and I needed a new Lamda sensor (and i got a new one) . and Also Tested the ECU and it's totally Fine .
As for supply , i installed new Injectors ,FPR And the Old Fuel Pump was a weak , so i got myself a new one and i installed it this morning .
this new one is great i felt the difference while driving .
but still my Car is still having the same problem .
So Around an hour ago , it did this and it was annoying ,
so I disconnected the ICV / ISV , The car was still running and it didn't go off .
So I drove around 11 kilometers with the ICV disconnected , The car was great at high rev's but di the hesitation / misfire at low RPM's after i completely diconnected the ICV plug .
Could all of my problem was because of a faulty ICV ?
and How would i test if it's running correctly ?
The Car has an alpina C2 2.7 engine in it , and it Rev's at 900 rpm .
any ways , i've noticed the ICV doesn't have any tension to it's moving Door/block piece .
Here's a video of how my ICV door runs .
and is there another way to test it using impedance meter ?
As far as i know , the ICV block piece should have a rebound (spring operated) not sure if the M20 is the same ?

[Brianmoooore]

No spring return on a M20 ICV. It's essentially two electric motors fighting each other, and the amount the 'door' is open is determined by which motor is being fed the most power.
ICV only controls idle speed, and will not cause the problem you describe. Without seeing the car in person, it's difficult to diagnose, but it could be an electrical misfire, or the result of the fuel mixture being too lean at that point (or both, since a lean mixture is more difficult to ignite).
Hesitation on pick up from idle can be caused by an incorrectly adjusted TPS, with the idle switch not turning off at sufficiently low throttle opening. It must switch off immediately after the throttle butterfly leaves its stop.