Hi, I bought my 1995 SC300 about a month ago and I've encountered a couple troubles with it. It idles rough and jumps when the it shifts up gears. Sometimes when i start it, it runs rough and then turns off. I am also leaking oil a little bit and I think it may be from the valve cover. I'm not really car savvy but I'm doing my best to learn. Any input is appreciated. :-) thank you.