If you are driving your car and notice that you are losing power as you accelerate, there can only be one of two reasons for this. Either you do not have enough fuel in your vehicle or you do not have enough power. There are many reasons why your vehicle may be losing power, especially when accelerating. Some of these common causes are: Mechanical problems such as: Low compression, clogged fuel filter, dirty air filter, clogged Exhaust Manifold Malfunction of sensors such as: