When the ABS light stays on, and the engine starts having trouble...that usually means the OVP relay needs replacing. That could easily be your problem.

Also, how much oil is your M103 burning? Mine was burning so much that it would foul the plugs after a little less than two months, and it would make it lose all kinds of power, hesitate like crazy, and made it VERY hard to cold start. I had to replace the plugs every two months or so until I finally sold it. New owner replaced the valve stem seals, and now all is well from what I hear.

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles