Hopefully someone here can shed some light on this issue I've been chasing. I have a 2000 Expedition, 5.4L, 4x4, 160k miles. Whenever I'm driving up a hill and I press lightly on the gas, it intermittently will shudder. If I press heavily on the gas, it'll stop. It also stops whenever I turn overdrive off. I recently had the transmission serviced 4k miles ago. The whole reason I got it serviced was because of this issue and it did not resolve it. So, any ideas? Any advice will be greatly appreciated!