Hesitation/rough acceleration ONLY after car is warm!

[Tu0cs]

I was wondering if anyone can help me.

My car runs perfectly when cold and then after it warms up, it runs like shit. It seems as if its low on power and hesitates during acceleration.

I've already changed a LOT of things:
-Checked for vacuum leaks 3x over
-Changed coolant temp sensor
-Changed fuel filter
-New dist cap/ rotor
-New spark plug wires
-new ignition coil
-spark plugs changed recently along with O2 sensor
-cleaned MAF --> also checked it by unplugging/replugging
-cleaned throttle body

Can anyone please give me some insight on what is wrong?
The car is a '90 325is

Thanks.

Oh, also, the stomp test reads 1444 - no errors.

[86_325_GMW]

plugged converter??

[yert315]

Throw another coolant temp sensor in there. I bought a new one that turned out to be faulty. Also be sure it's the correct temp sensor.

[Tu0cs]

I'll look into the plugged converter (although I would think that there would be a lot more problems if this was the case)

I guess I'll try another coolant temp sensor, I changed both, the one that reads the temp and goes to the cluster, and the one that measures the temp of the engine to the computer:

http://www.bmaparts.com/item.wws?sku=BMW085018&itempk=77091&mfr=Meyle&weight=0.050

http://www.bmaparts.com/item.wws?sku=BMW013881&itempk=74063&mfr=FAE&weight=0.070

I guess i'll check the fuel pressure regulator as well, to see if that's working correctly...

[SUICIDE109]

yea my car does kind of the same thing, if i drive on the highway for about 30 miles or so then do city driving it acts like it starves usually around 4,500 but can happen as low as 2k... if I rev it up to about 5k it all goes away. Guessing its some kind of temp sensor...

[Tu0cs]

I dunno, it happens throughout the entire RPM range after the car has fully warmed up.

Anyone think it could be the ecu?

Thanks.