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Has the engine wiring harness been replaced?? If not you need to do that asap. Try not to disturb it too much while you're checking. The problems you describe could be due to it.
If it has, then read the codes (DTCs) stored in the Diag Module; use the procedure in MENU#2 on my pages.
Let us know what you find.
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Regards . . . . JimF
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'94 S500 Cpe
Visit my Mercedes Web Page
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