First let me say that starting problems is the best way to explain it. What happens is that the Trailblazer will start fine but once I drive it some place stop then go to start it the Trailblazer won't start unless I give some gas. Then the engine idles high,so I'll turn it off then try again. What happens then that it will start, it will idle up some, not as high a idle like before .It used to do this every now and again, but now it's happen more often. Has anyone ever had this happen? Can anyone help me with this

 

Is the Check Engine Light on the instrument cluster illuminated?

Have you scanned the OBD II system for Diagnostic Trouble Codes? If not that is the first thing that must be done. If you have had the OBD II system scanned, what are the codes - all of them?

Have you checked the fuel pressure? Have you checked the fuel pressure regulator to make sure it is not leaking?