ok so I just bought my 2006 trailblazer ss its got 150k. drives great and runs great. the other day I came home. parked the tbss and went inside about 20 min later I came out to start it up and did nothing. all the lights came on. I can hear the relay kicking on and off in the main fuse box under the hood. did the old bang on the started trick. didn't do anything. unplugged the battery that didn't do anything. and then just randomly about an hour after messing with it, it finally decided to start out of nowhere. just fine. cranked right over and started up. has been starting fine until today. I turned the truck off then waited about ten seconds then tried to start it again. same thing. wont do anything. about an hour later of messing with it again it just randomly starts again. any ideas on whats going on? thank you.