I once had a leak in the gaskets between the throttle body/egr/intake and my intake filled up with this putty like substance. All of my collant got sucked into the engine. it was not a fun clean up. Take the intake tube off of the TB and see if there is a leak before it gets worse.
It could also be the lower intake gaskets. Did you purchase intake gaskets with silicone around the water passages? If not, did you put a small bead around them before you lowered the intake in place?
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-1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway
-1994 Ranger w/ 427cid windsor (daily beater)
check it out!
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