Vent solenoid isn't that bad to change. Misfires can be caused by many things, plugs, bad wires, cap/rotor, bad injector, bad wire to the injector.
Easy to test the signal that turns on the injector. You need a simple test light called a noid light. Unplug the injector plug in the noid light and start the engine.
If the light is flashing the ECM is probably OK and the issue is with the injector or the ignition on that cylinder.
Monday, April 3rd, 2017 AT 9:49 PM