2001 audi a6 2.7t problems?
 

Hi I have a 2.7 biturbo. And to start off the car has a minor oil leak not sure if its the turbos or manifold gasket. I just installed a boost gauge and with it to the floor the car is pushing 4psi which I believe is not normal. Anyways I believe I have a problem with the torque converter or transmission. Its seems to be when I start my car drive off, if the rpms pass 3 all my warning lights come on. Also lets say I was driving fast slowed down for a turn and I dont complete stop hit the gas the theres a pause then boom! The whole engine jerks sometimes it gets stuck in 3rd gear for about 5 seconds the car has 194k on it but the motor is very strong just needed some suggestions on what I should be replacing