Driving a vehicle with a Engine Lose Power problem can be dangerous and could lead to a loss of control of the vehicle. The engine power loss could be due to a number of things such as a faulty spark plug, a faulty fuel injector, a faulty fuel pump, or a restriction in the air intake. In extreme cases, if the issue is not addressed quickly, the car may stall out completely and could cause a crash. In addition, the car may not pass emissions tests due to the potential of increased emissions coming from the engine.