I got a tune up 3 weeks ago, when I got the car back I had multiple lights on svc engine, stop engine coolant temp, and I was still leaking oil pretty bad. So I took it to GM and had them check it out and they said that the other shop never replaced my oil cooling lines they just did a temporary band-aid on the hoses, and that my number 5 valve is missfiring and that it was only giving 100 psi on the compression test. GM said to drive it until it dies and that it's not worth replacing, I would really like to keep this car, Soo... I want to know what would be the best route for my car? Rebuild the engine or try and find a better engine to swap it out with? Also If I can find an engine I might have somebody that will put it in cheap, what would be a good price for an engine swap?