so my car has been overheating if i idle for more then ten mins. i had a pressure test done to the coolant system to see if there was a leak somewhere external or even show a internal leak. well i could hear it leaking from somewhere around the throttle body so i looked closely and found my lower intake gasket is leaking.i could see some coolant bubbling right near the manifold meets the head. my question is this ususall for this motor? should i just change it and hope it fix it.also is there a coolant passage going from the lower intake to the heads?looking at picture i don't see a passage.. thanks for any advice in advance.