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      12-09-2018, 10:49 AM   #10
tracer bullet
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Drives: '11 135i , '15 X3 35i
Join Date: May 2011
Location: Saint Paul, MN

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I could believe plugs as well, at the mileage it is indeed time for them. In previous cars I've owned over ~ 30 years this sort of behavior stumbling when accelerating was typically the plugs / wires / or distributor cap & rotor, 2 of the 3 which aren't of course on an X3 leaving just the 1 left for where I'd start. The air filter idea is solid as well if you aren't sure the last time it was replaced. That for sure is an easy DIY.

This is the one I put into mine, but it was a 2015 35i and your older one may be different, check to be sure.

https://www.amazon.com/Mann-Filter-2...ype=automotive
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