Just bought the car so i don't know if these poblems are related or not, but first it is showing a check engine light and when i take it to get read they are unable to make a connection, second the car is stalling, sputtering when hard accelerating at 40 and 80 mph or 5500 rpm, and lastly the transmission is rough shifting from P to D and when in Reverse and the gas pedal is pushed the car shakes violently, but both only after being driven around. Any help would be great. Thanks