My PCV Valve is rattling since last Tuesday when it started to get really cold outside. I was wondering if it started to do that since it is cold out now. I replaced it with some cheap piece of crap PCV Valve from Advanced Auto Parts which only cost me like $3.50 and it is still doing it. So, I am just going to get an OEM one. You guys think that will stop it from rattling. Last Tuesday my 2nd or 3rd cylinder valves started a minor tap/or ticking noise. Don't know what caused it though. Both problems occurred when it got really cold outside. I drove my car Monday night and it was fine. Now, when I drive all I hear is the rattling from the PCV Valve and a tiny minor tap. The car also when I am slowing down to stop it is trying to stall out and shut off on me when I press in the clutch. The rpms just shoot down. I have idle control on there for the cams and everything. When I go to full throttle the car studder's after 3500 RPM. I don't go lean or anything, just studdering. I was told to get some BG Fuel System Cleaner, which I did and I haven't really gone full throttle on it yet to see if is still studdering though. I will check when I leave work. Any comments? Thanks!