Question

2006 Hummer h3,  I'm getting a set of codes  KPW2000 &  ISO9141. What do these codes mean and how to fix, I will explain,  in the morning when motot is cold, I will go to start and engine seems to kinda skip , I turn off key but motor keeps turning over for a breif second.  Then I try to restart it and it just turns over and.over with out even a promise you know like it some what wants to start, but that didnot even happen, then I disconnect the ground at Batt. For a min. Or 2 hook it back up and it starts Imeadally with out question. I hope this helps you, thanks. BB..