Ok, about a week ago my car started shaking when it starts up. then i noticed it would smoke from the exhaust when i gave it gas( around 45-65mph, not from a stop). so i changed my oil and oil filter, and both symtoms seem to be getting worse. so i dont think its anything to do with oil issues. i have been doing some reading and i think it may be my fuel pressure regulator, because i do have a tendecy to top off my car. so any insight that anyone could give i would appreciate it.

thanks