Liquid In Intake

i went to change my throttle and egr spacer to a 70 mm bbk. and found inside intake some kind of liquid. i put it back together because i spoke to a friend and they said its fine just run it but now im worried. im going to take it off again today and see. anybody have a clue what it could be and what could be causing this? its all stock.
 
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Gas from a leaky carb, condensation from temp changes, rain water, antifreeze if the manifold is cracked or animal urine? Just a few guesses since I'm not there....