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A leak in the pcv system will cause a major vacuum leak because the hose connects to a fitting on the intake and its large enough that it sucks in quite a bit of air.All the symptoms you listed are typical of a vacuum leak too.The leak could be causing a misfire which in turn could cause the knock sensor to begin reacting.Fix the leak before you do any other trouble shooting.The rattling sound you're hearing is probably detonation.When a misfire occurs,the extra air that didn't get burned in the combustion chamber gets read by the o2 sensor as extra unmetered oxygen,so it tells the computer its lean.A lean fuel mixture will cause detonation.The knock sensor is supposed to kick in and tell the computer that the timing needs to be reduced in order to get rid of the detonation.Fix the vacuum leak first,then take the vehicle to Autozone and get it scanned for codes.It sounds like the knock sensor is malfunctioning.The scan should show a code if its faulty

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yes fix it