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Thanks for all the help guys, we really appreciate it!
Update:
We cleaned the MAF and air intake (throttle body). There was a fair bit of oil in the tube, not quite a puddle, but it was definitely present. We replaced all of the spark plugs, a couple of them were quite black and have definitely seen better days.
We noticed that one of the hoses going between the intake and AOS was loose, so we believe this is the cause for the rough idling. When we just started the engine up, the idling seemed completely normal and only a little bit of white smoke came out of the exhaust on initial start.
We tried giving the car some throttle (around 1800 - 2000 RPM) and that rattling noise is still present. We are no longer getting any misfire codes, but we are still getting P0012, which is the intake camshaft position over-retarded.
Are you still thinking that it could be the hydraulic lifters? To me it seems possible that it is the timing sensor and/or solenoid?
Thanks again,
Sean
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