Based on the mileage, we would replace the spark plugs and wires without wasting time testing or inspecting them. It is only after that, in the unlikely event the problem is not solved, that we would spend our customer's money on the time needed to dig deeper. If you do not want to start with that, or if those parts were replaced recently, switch the spark plug from cylinder two with one of the others, erase the fault code, then drive the vehicle to see if a new fault code sets for the cylinder you moved the suspect spark plug to. You can do that with a third cylinder for the wire, and even another cylinder for the injector. Moving parts to different cylinders can be an effective way to find a part with an intermittent problem.
You have not listed a model yet. I do not know if you have a truck, a minivan, SUV, or a car.
Thursday, April 20th, 2017 AT 5:53 PM