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Denso O2 sensors are excellent, I run them in my car. Did you clean your MAF sensor? Are the clamps on the induction tubing from air filter to throttle body tight?
Remove the cam sensor. Check for oil. Replace pos felpro cam seal with Ford seal.
Copper plugs are fine, you just need to change them 4x as often as double platinums.
If you want help, you will need to answer our questions:
The fact that they are carboned up suggests rich mixture, oil consumption problem, poor spark, or similar problems. I would look at all 6 - what do each of them look like?
Are you having poor gas mileage? or significant oil consumption? If not, the new wires would be suspect to me.
Copper plugs are fine, you just need to change them 4x as often as double platinums.
If you want help, you will need to answer our questions:
The fact that they are carboned up suggests rich mixture, oil consumption problem, poor spark, or similar problems. I would look at all 6 - what do each of them look like?
Are you having poor gas mileage? or significant oil consumption? If not, the new wires would be suspect to me.
Did you keep any of your old parts (plugs, wires, etc...)? They might come in handy for diagnosing this problem, assuming they're still OK.
I bet one of those duralast parts are your problem.