how long has it sat for? my car sat for 2 months and then it absolutely would not start. it would crank over fine though. i tried jumpstarting it tons of times and it wouldnt. i finally called a tow truck guy and he insisted on jump starting it. after 40 minutes of trying to jump start it and me calling the tow truck driver an idiot, it started.

needles to say i gave that tow truck driver a bigass tip and spent the rest of the day embarrassed...