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Good time to take a look at the injectors, clean them. Replace plugs and coils if mileage is right. Good time to plug the PCV ports in the head of you are going to do external low side PCV to reduce blowby at idle. Otherwise...
I'd recommend replacing the valve cover entirely if high mileage, which comes with a new gasket anyway. Hard to tell sometimes if the valve cover is actually cracked, and I'd cry if I replaced a gasket on a cracked cover.
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