I have a 1990 500SL with 60K miles. I recently replaced the EHA when it was doing a similar thing. Heres the deal.. The car runs fine until it reaches 100degrees, or warms up...it then will stall at low speeds and when you restart and try to accelerate, it will only allow 2500RPM max,(limp home mode) however I can manipulate it to get the MHP up, (like 55mph)...when I take the foot off accelerator the RPM's immediately fall like its going to stall, seems like something electronic. Pushing the accelarator to the floor still only gets you 2500 RPM. The curious thing is It only does it after it warms up. Is this a Throttle Actuator, KE unit, Clogged Cat Converter, Airslide, potentiometer track gone bad. ASR problem? I am open to suggetions as we are stumped and my Mechanic can't pull codes with the model/year.

Thanks,
James