Abstract: A portable vehicle throttle lock which includes a base member having opposite end portions. An accelerator pedal engagement means is formed in or connected adjacent to one of the opposing ends of the base member and a brake pedal engagement means is formed in or connected adjacent to the remaining opposing base member end. Also included are means for adjustably lengthening or shortening the base member. In operation the throttle lock is engaged between the brake and accelerator pedals of a conventional motor vehicle. An operator may lengthen the throttle lock via the adjustable lengthening means in order to adjust the rate of engine shaft rotation. The throttle lock may be manufactured and installed such that an operator may return the engine to idle by simple depressing the accelerator pedal thereby causing the throttle lock to disengage.