Recently, my van started shifting strangely. It doesn't happen all the time, but when I upshift in manual mode, there seems to be a delay in the transmission completing it's shift between 1-2, 2-3, and 3-4. It goes into gear, but about two seconds later, it lurches very slightly. It does not do this when downshifting. It also does it when I set the stick to 'D' and allow the AMT to shift on it's own. I really don't think the clutch is bad since I don't hear any grinding and it only happens during the upshift. Has anyone else experienced a similar issue?