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1991 325IX: knocking noise..low speeds, but is fine..power loss…

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Hi, I have a manual...
Hi, I have a manual 1991 325IX BMW with 240k miles. It started to make a knocking noise and now has started to spudder at low speeds, but is fine above 40. Not a huge power loss but some is noticed. I think I also smell gas a little stronger in the exhaust. It is not smoking, just riding and sounding ruff.
I have always maintained it well with tunes ups and oil changes.
Can anyone suggest what I might be looking at here and what might be basic problems I should trouble shoot first :(
Submitted: 8 years ago.Category: BMW
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Answered in 35 minutes by:
6/19/2010
BMW Mechanic: Steve, BMW Expert replied 8 years ago
Steve
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How, how long has it been since you replaced the fuel and air filters, and the spark plugs?

 

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