Symptoms of Bad Nissan Fuel Injectors

Always keep in mind that there are other components that can fail and act like failing fuel injectors.

Hard starting
Gas smell when turning off the engine. Injectors can leak when you turn off the engine causing a hard start condition.
Rough idle
Lack of high speed performance.
Hesitation when stepping on the gas pedal.

Check for trouble codes using an ODB II tester.

Here are a few associated with the fuel system:P0300: Random Cylinder Misfire

P0301:Cylinder #1 Misfire.

P0302: Cylinder #2 Misfire.
P0303:Cylinder #3 Misfire.
P0304:Cylinder #4 Misfire.