Help! My mother called me and her 99 e430 won't accelerate over 60 mph. She also tells me that her check engine light comes on when her fuel gets low or when she get's fuel from time to time. We were thinking it was a bad gas cap and replaced it.

Would a bad fuel filter be at the root of these problems?

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1972 220d gone lived a good life
1972 280se gone but not forgotten
1978 300D the best i ever had
1977 350se speed racer gone
1995 honda accord lx coupe victim of the growing family
1988 300e gone but not forgotten