Our 2005 Trailblazer has just started having issues starting. It is very intermittent. Almost 2 weeks ago my battery died and right after replacing it, it didn't want to start right away. Then for a week it was fine, and then I went to start it and nothing. I kept trying for about 20 minutes and finally got it to start. My husband replaced the ignition switch as after the battery change my aftermarket radio wasn't shutting off any more so that fixed that problem and it started for a day or so and then again on Friday afternoon after driving around all day I couldn't get it to start even after trying several times. Finally that evening my husband messed around with it for about 20 minutes and finally got it started to get it home. He took off the starter and we had it tested and it was good. We are now puzzled and not sure what to do, please any advice would be great.