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.