hey guys i have a 2006 chevy 2500. sometimes when i go to start it after its already been warmed up i hit the key and it goes to start but dosent. teh starter makes a noise for a second and then you feel a clunk. then you go to start it again and it starts rite up. dosent do it every time but only when i have already ran the truck for a period of time. its doing it more often now so i am thinking its the starter. thanks