My 08 gp has been acting up lately, off the line it hesitates then goes in to gear pretty hard and recently has been slipping between gears. It only used to do it seldomy when hot but now seems whenever it wants. I've read many posts here and a lot point to the pressure selinoid. But from what I gather, my 08 doesn't have one. No trouble codes and I had my flush done when recemmended. Any ideas.....