Pull your plugs and see what color they look. I had a 95 that had a head gasket problem and id did exactly what you just said. Look for greenish tint to the plugs. Otherwise, start the engine - just after the idle starts to smooth out, stop it and pull the plugs and look at it. I bet that one or two of them are wet with coolant.
I highly doubt your intake because it's not the same as a v6 where the intake has coolant running through it.
Hope that helps diagnose your problem.