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Running lean usually refers to a condition where insufficient fuel reaches the combustion chamber. A clogged fuel filter could cause this. Swap it out for a new one before you ruin your spark plugs or, even worse, a fuel pump. Also, vacuum leaks can cause this condition. Go ahead and change the fuel filter since they are cheap and you will need to soon enough anyway. But, I think a vacuum leak is a more probable cause. Mention your car and engine type for better answers.

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14y ago

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