Whats up Audizine, I'm a 3 week owner to a used Audi A4 1.8t. When I got the car everything was fine. In the morning the car accelerates fine, no shuddering or vibrating. I've changed coilpacks, and plugs. Coming up on my first oil change soon. I start noticing this stuttering/vibrating after i drive the car around for like and hour or when the weather gets hotter here in Southern California. I'm kind of leaning towards the transmission going. i have looked at the axles and havent noticed any grease being thrown around. Am I looking at an expensive fix in the transmission?