Cleaning the injectors is not likely to help but sometimes the injector cleaner does a half decent job with the carbon, or at least it used to back in the day when you get good injector cleaner. You might be better off doing a walnut blast job if you suspect carbon is your issue.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)