Get an auto stethoscope or use the end of long screw driver to listen to the fuel injectors.. You should hear a crisp clicking nose from each injector. If not, you either have a failed or clogged fuel injector causing your power loss.

If all the injectors checkout okay, check the fuel pressure on the fuel rail.

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Russell McMahon
Tulsa, OK
2001 CLK 320
1992 400se
1993 400e
2000 320ML