New engine problem, need help !!!

7am ramblings
Pull your dipstick and check for coolant there. Does it look like a milkshake? If so, that's a coolant leak and you need to pull the head(s).
You said the plug looked wet but what did it smell like? Oil, Gas, Coolant?
You can also start the engine cold and remove the rad cap and watch for bubbles as the engine warms up, this would indicate a leak (head gasket, crack, etc...)
Is there oil in the coolant?