540i rough idle, help!!!!!!

well, i cleaned my ICV and maf today, what a difference it made in performance! idle is smooth as silk. drives better too...
but, i noticed something when i was doing this (could i have caused it???
i usually get into my car and drive off not noticing sounds in the morning because im always late for work
today i sat and listened after i did the maf/icv shit.
and i noticed something! the idle seemed to be kinda rough, sounded like something was knocking ever so slightly in the engine, not like blown engine kinda thing. also when i had passenger door open, i listened to the idle and it sounded like tehre was some kinda liquid flowing. especially around 1200 RPM... after 1500 exhaust was too loud to notice it. (magnaflow 14816 w/ no resonator!)
this is on a very hot day (almost 100ºF) so i donno if that was just coolant flowing (i think its mostly water in there from when my water pump got screwed, could that be the cause of it?), but the rough idle is definitely there... could need an oil change too.

here are some videos of the sound, ignore the cheezyness and me :P
http://www.youtube.com/watch?v=IH20Lso_9gY
http://www.youtube.com/watch?v=zxGLah1_CQw

thanks guys!
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