So I have had a Shudder in 1st and 2nd when accelerating it's the 5 speed automatic. At school i took some pressure reading and the gauge was fluctuating like crazy. I took it out and out it in 1 and it still did it. My teacher a 25 year master tech at Tasca ford in Cranston RI said its my ORC ( over running clutch ) i called the dealer and they are replacing the entire transmission Under my ESP warranty