Hello this is my first post
I have a 2004 Pontiac Vibe but with a twist . My Vibe has a GT engine with the base four speed automatic I have no idea how the made it work but it does its a 1.8L vvtl. Recently I have noticed that when accelerating my gas pedal will not go down and u have to to an incredible amout of force to do so and the it lurches because you cannot ease into it. Also when getting on the highway while accelerating the car shakes violently but when I stop accelerating and maintain my speed it stops .please help.