100K is tuneup time (new spark plugs,etc) - has this been done? - maybe that quarter tank had water in it? - high ethanol gas sometimes results in what you describe - tried that stuff once and it took 3 tankfuls to clean it out and get back to better mileage and performance

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Mark _______________________________
2001 X5 4.4i topaz blue/sand Sport, complete Dinan S2 , hitch, V1, tint, BSW Stage 1, Alpine INA-W910BT
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