Turn on turbo mode or sit through the weird behaviors. Space = Toggle rather inside of a vehicle or not. R = Refuel. Engine controls: Right Arrow = Start. Left Arrow = Stop (or set on to 0). Vehicle controls: Right Arrow = Key Clockwise. Left Arrow = Key Counter-Clockwise A = Clutch. S = Brake. D = Throttle. W = Shift Down. E = Shift Up. O = Cycle Driver Info Center.
Put on turbo mode for no miss fire and for more fuel efficiency (idk why it does that). I used the spark plugs (assuming they 3.5 inches) and if I did it right it got roughly 2 cubic in-