I have a auto manual trans roadster so today while on the highway I decided to try playing with the car in manual so as doing about 70 I switched to manual mode it put it in 4 gear I dropped it to third took off and switched to 4 when I got about 80 5500rpm I noticed after getting up the highway I had a trail of white smoke behind me now the car didn’t drive different sound different nothing and in auto mode there is no white smoke anyone know what this could be