My Saturn Wagon won't start

I have a 2001 Saturn LW300 V6 - My car won’t start. I have replaced the battery and still nothing. Yesterday my car jerked while I was driving it, and jerked so hard when I was backing up that I thought I had hit something from the backlash. The last few days it has been jerking when I started it but did not after it got warmed up. The lights on my dashboard come on when I try to start it but nothing else comes on. Any ideas