i am working on my sisters 99 escort wih 157k miles on it. i pulled the valve cover today and it was about as sludged up as you can get. black goo everywhere. i ased her what oil she uses. she gave me a blank stare. that's all i got out of her before she went to the airport. i drove the car around. its got decent power but it runs awfully rough. almost stalls at stop lights in gear. (its an automatic) i will be going to the j-yard on monday and stripping a 97 escort for parts to give to her. anybody have any suggestions on what not to overlook?