Most times when the engine has only been running for a couple of minutes half way through 1st gear there is a flat spot. It almost feels like the fuel is cut off for a second. The tach does drop when it happens. Of course there are no codes so the dealer says they cant do anything about it. When they take it out for a test drive they drive it like they stole it and it rarely does it when completely warmed up. This transmission really likes to be driven hard but that isn't my style, its hard enough on gas as it is driving it easy. Any one else experiance this flat spot in first gear?