My BMW M9 has suddenly started to have a rough idle. It seems to be idling at a lower RPM and occasionally stumbles before picking back up. What could be causing this issue?
ReplyIt is possible that the issue lies with your spark plugs. Over time, spark plugs can become worn and dirty, causing a rough idle. I recommend checking and possibly replacing your spark plugs to see if that resolves the issue.
Another potential cause could be a dirty or clogged air filter. If your air filter is dirty, it can restrict airflow to the engine and cause a rough idle. Try replacing your air filter and see if that makes a difference.
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