Small fwd city car of awesomeness

Hi there , spent this day building this, it has tons of features but damn not working propely again :((((( dont know why but 3rd and 4th gear that worked perfectly in bmw , car just dont accelerate, its 3:54am and i have no idea how to fix, fuk it :\

A - brakes
W - shift up
S - shift down
slider - clutch