My 1994 K1500 5.7 is losing coolant. No external leaks and no smoke. I'm starting to think intake gaskets. I was under the impression this was only on the vortec engines and not the tbi ones but now I hear it is most of the mid 90's 5.7's. Anybody seen this on a TBI 5.7? I tried pressure test and it fails pretty quickly. Coolant is going somewhere it is not in the oil so I think its getting sucked into the intake stream thru intake gasket.