Every time I get on myhummer and try to start it, It wont start on the first crank. I have to do it a least two times before it starts. i have changed the wiring, spark plugs and still didnt help. does anyone know what it could be?

 

I had that problem when I had the dealership install a security system. Not sure why it did that but removing the security system fixed the problem.

 

you mean it does it every time hot or cold... even if you start it and stop it and then start it again immediately?