I have a 2000 Chevy Venture, Last Saturday I went to leave for work and it started normal. I stopped to get gas and when I went to start it back up all it would do was make a clicking sound. We ended up pushing it home and low and behold as soon as it got in the driveway it started and has started fine since, until today. It started the clicking sound again so we tapped on the starter a few times and I was also fiddling with the key as well since it seems to wanna stick like its locked. after doing both it started again. My question is, Is it possibly the starter or maybe the ignition switch or maybe even the Ignition lock? Any advice is greatly appreciated

 

It could be the starter, but it could be a low battery, believe it or not. After you get it to stop 'sticking', does it turn over strongly or weakly?

 

It could also be poor battery cable connections...