I have a 2003 with 139k on it and have the sticking throttle valve. It's been getting worse. Used to only happen on those hot summer days, but now even on the warm winter days, and here in MN that's not very warm, after a shut down every now and then, it takes a good pedal push to get it to shift. I've considered the sonnax kit and also considered a complete valve body change. Opinions ? It's just a stocker work truck. Thanks guys.