Got in my 1988 Nissan Pathfinder this morning and it is running extremely rough all the sudden.Then it would stall either during idle or while driving if I let off the gas pedal. The truck starts without any issue. Not really knowing where to start I first cleaned the distributor cap, contacts and rotor but that didn't help. I also checked the spark plugs and fuel pressure and those are good. At that point I pulled Error Code 11 Crank Angle Sensor/Camshaft Position Sensor from the ECU. So am I wasting my time doing any further troubleshooting other than just replacing either or both the distributor and Camshaft Position Sensor?