Group your car parts together. Ensure the wheels are unanchored. The Seat: Add a VehicleSeat to the car.
Roblox provides a built-in VehicleSeat object that automatically captures player input (WASD or Arrow Keys). We can hook into the seat's properties—specifically Throttle (forward/backward) and Steer (left/right)—to move our car model. [Roblox] Everyday Car Driving Script
If your car flips easily, increase the Mass of the base plate or lower the CenterOfMass using a Massless toggle on the upper body parts. Group your car parts together
Attach a sound to the VehicleSeat . Use the PlaybackSpeed property and link it to the seat.Velocity.Magnitude to make the engine rev higher as the car goes faster. Conclusion [Roblox] Everyday Car Driving Script