How do I fix this VehicleSeat BodyForce script?

What I'm trying to do is that if the player decides to move foward (throttle) then the seat will move with BodyVelocity. However it stays in place. It is not anchored.

while true do
	if script.Parent.VehicleSeat.Throttle == 1 then
		
		script.Parent.BodyForce.Force = Vector3.new(10,0,0)
		
		else if script.Parent.VehicleSeat.Throttle == 0 then
		
		script.Parent.BodyForce.Force = Vector3.new(0,0,0)
		end
		end
		end