Reading "How to Write Science Fiction and Fantasy" by Orson Scott Card is a good idea.
Besides that, you have to figure out if you have writer's block or are just burned out. If you're burned out, either take a break and read, or write something else (short stories work for me). If it's writer's block, then the problem you're having is probably that you're writing the wrong thing. If you're having to force the story, somewhere in your mind you don't believe it. Or you're starting in the wrong place, or writing the wrong scene. Step back and look at what you're writing, and what you've written. Should you start in a new place, or change the point of view of the scene? Maybe you need to start the scene a day before, or a day later. Is it a murder scene? Maybe you need to start at the time of the murder, or an hour before, or when the police arrive, or when your main character arrives. Play around and see if it starts to flow a little better. If you've got flowage, like the story is writing itself, you're good. If you are getting blocked, then you're doing something wrong.
Check this link out
http://www.hatrack.com/writingclass/lessons/1998-10-29.shtmlIn it, Orson Scott Card discusses starting a novel. He talks about how he could write, but that nothing worked right, the story didn't flow. After trying several different starts, he realized that he was starting at the wrong point. When he realized that, he was able to fix it.
Matt