Q: External leak and car losing coolant

There is an external leak that I can see and my car has been losing a lot of of coolant. My gasket needs replacing and I’m going to soon do that. Just need to find out if it is the upper or lower intake or both. Here is what has happened: Yesterday after starting my car, there was a very loud ticking noise. I drove it up the street a little to test it and there was a loss of power, it drove roughly and was hesitating. After opening the hood, I saw orange coolant (that had an oily feel) covering the top of the intake manifold (near the injectors). Red flag! I’m wondering if that is a sign of pre-hydrolocking. (I’m not driving until the problems are solved.) I’m wondering if that leak damaged anything internally and the elbows probably should be replaced. I’ve never done this before, but have an idea of how to… Will the problem be solved by my replacing the upper intake gasket and then doing an oil change, or is it the lower intake and should I replace the lifters?