Hello, everyone. This is my first post on this forum.
I appreciate all parties' willingness to share knowledge.

I hope someone may be able to assist me...

I have owned a 1993 Mercedes Benz 500E since March, 1998.

Since approximately January of 1999, it has exhibited the following, dangerous behavior/condition:

- when making sharp left or right turns and/or going up or down spiraling parking garage access ramps, my engine cuts out/dies

Sadly, my local Mercedes dealership has proven to be both reluctant and, ultimately, incapable of diagnosing and fixing my problem! I first reported the problem over 6 months ago! Since then, my vehicle has been in and out of the shop, to my great frustration. Chemical additives were even introduced to my fuel system to attempt to raise the idle speed - with zero success. Again, absolutely nothing has fixed the problem. I find this situation both unacceptable, incomprehensible, and frustrating - not to mention very dangerous!

The only modifications in my vehicle follow:

- RENNTech ASR defeat switch (relay)
- BRABUS sport steering wheel and airbag
- Precision Auto Design (LH unit) performance chip
- Precision Auto Design airbox w/high-flow K&N air filters
- AMG rear silencer (AMG part # HWA-124-490-1721)
- 18" AMG Monoblock Aero II wheels w/Dunlop P9000 tires

The only additional data I can provide is:
- my idle speed (at rest) is below 500 RPM (480-495 RPM)
- my vehicle has been running Mobil-1 since 1996

I have all new fuel-related electronics (E-GAS, etc.), a new throttle body actuator and a new fuel pump. My vehicle is (otherwise) in excellent working order (needless to say, I keep it immaculate). My odometer currently reads 87,000 miles. I have had all scheduled (dealer) maintenance performed, without exception.

I believe different production years of the 500E/E500 vary, in BHP; if so, do they also vary in (at rest) idle speed? What should my idle speed be while in "Drive"
(not in "P," as the rate would increase, obviously), please? Can any other 1993 500E owners provide any data?

Any/all advice you might provide will be MOST appreciated; thank you very much, in advance, for your prompt reply.

With kind regards,