Question!
Car and Engine type.. 1999 Pontiac Grand Prix 3.8L 3800 Series 2.
Engine intake manifold gasket is failing.
Oil is leaking into coolant.
Is engine done for? It has been ran for a lot of miles

I would like to fix the car, but I don't have money for a new engine. Can anyone help me diagnose what the problem is? And how to fix it? (Tools, parts needed... video?)
As I stated before, I am leaking coolant into my oil. I have not noticed coolant leaking into the oil..