Help... My 06 automatic has a terrible shudder throughout the car between 3-4 gear. More noticeable at a lower speed but still present at a high speed. Just had the car into the shop and had the transmission looked at with fluids and filter changed. Also had fuel pump replaced by the Ford Dealer due to issues with power and stalling in traffic. Mentioned the shudder issue and they say they can't find anything wrong with it but it never shuddered until early this summer. Any ideas?