need serious help

my car leaked a little bit of coolant and somewhere down the engine bay by cyl. #4 was smoking…nothing crazy.so just now i added sum coolant(it was mixed)…topped off my oil and checked my spark plugs…cyl. 3 and 4 have oil in them and the #3 spar plug was dripping a little bit when i took it out…also i put everything back together, started the car, and heard a lite but rapid knocking noise closer to cyl. 3 and 4. When i rev it to about 2k rpm…the noise quiets down…i NEED MY CAR TODAY-NEED HELP ASAP

http://www.g2ic.com/forums/announcement.php?f=29&a=13

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