Please note that all of this is just my personal opinion and I don't pretend to be absolutely right. It's not directions to a repair. I only tried to give you some tips to help you find defect of your engine.
Quality repair is possible by only very skilled mechanics.
So, don't try to repair anything by yourself if you not sure what to do. Take your car to a dealer or repair station. If you have any questions or suggestions, E-mail me. I'll try to make this site better continually. Author I receive so many questions regarding to a car diagnostic.