Your first inclination is to purchase fuel injection cleaners when your Plymouth fuel injectors begin to fail - but that might not be the solution to your problem. Of course, clogged injectors can result nasty engine detonations or misfires, knocking, loss of power and a reduction in your gas mileage. Your Plymouth vehicle might die suddenly at stop lights, and you might risk failing an emissions test because of higher hydrocarbon and carbon monoxide emissions. When your Plymouth fuel injectors fail, there will be 'lean' misfires, which will trigger the 'check engine' light to turn on. When you check the electrical code diagnostics, you will see a P0300 random misfire code. Depending on which injectors are failing, you may find one or more misfire codes for individual cylinders. A 'lean misfire' means that the air/fuel mixture that is too lean to sustain combustion. Unburned fuel is being passed exhaust system, which boosts hydrocarbon emissions and reduces gas mileage. The blockage comes from the residue of the operations of your Plymouth engine. Detergents are added to the fuel mixture by gasoline manufacturers to help keep the injectors clean. Be warned however: those detergents can only work so far, especially for cars that driven mostly for short distances. Age, heat and stress can wear down your Plymouth fuel injectors, or the circuits connecting them to the sensors and on-board computer until it is time to replace them. When you determine it is time to install new Plymouth fuel injectors, replace them with the high-quality manufacturers' sets from our site.