Before I bought it I took it to a mechanic to see what was wrong with it. He told me my timing chain was going to break but that I could drive it until it does. Tomorrow I'm taking it to Pepboys to have them look at it. What should I do? I only have 300 dollars and I'm not sure if I should put it off and just get my engine flushed and my oil filter and stuff changed or what. I just want the best deal possible and for them to do it right. Any advice?