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This would be the forth cylinder from the front(where the pulleys,and belts are).There will be a coil,and under the coil,is a boot,connected to the spark plug.The miss fire could be any,of the three.I would replace the spark plugs (all four)and the boots.Then if the miss fire is still there,replace the coil,on number four cylinder.
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The Code(s) should be telling the specific cylinder(s) that are misfiring. Do you know waht the code is?
Target those cylinders 1st before testing the unaffected cylinders.
The following should isolate the problem(s).
1. Spark plugs - take out-reconnect back to wires and test spark plugs for getting sparks. If none: Don't replace them yet. GO TO 2. If the spark plugs are worn, dirty them replace them.
2. Remove spark plugs form end of ignition wires and test for spark from the wire. If none: Don't replace them yet. GO TO 3.
3. Remove the wires from the coil connection and test the coil for spark for each cylinder. If none: Don't replace it yet.
4. Test each spark plug and wires this way.
5. Coil Packs normally provide fire for 2-cylinders at the same time. The two are paired across from one another.
6. Test the coil for fire, amount of fire and if there is both cyclinders firing.
Misfire and the O2 Sensor got replaced??
Good Luck and get back with me if you need additional help or if this solved the problem.
If it ran good prior to spark plug replacement, then yes, I'd be looking real close at the plug wire to that particular spark plug. Perhaps it pulled apart inside boot upon removal. It may even be an indication that they are all getting weak, and time to think about a new set if it's originals.
The 300 and 302 mean the following 300 I believe is random cylinder
misfire. The 302 means cylinder 2. I would not rule out wires or boots
being bad especially on cylinder 2. P0352 Ignition Coil B Primary/Secondary Circuit Malfunction
Intermittent Loss of CMP or CKP. The CKP usually refers to crank
position sensor. I would try the coil first especially if you can get a
used one. If the plugs are old I would also change the plugs. Once
again don't rule out wires.