I need help! I have a 2002 Tundra v8 4x4. Let me first give you a little history. The O2 sensor (sensor1/bank1) went out about 6 months ago. I finally got around to replacing last week. I also changed the plugs. After about 300 miles on the new equipment, my truck lost power and died. After repeated attempts, it would not start. Now to the good stuff With the key in the "ON" position, I hear a constant high pitched humming sound from the throttle body assemby. I first thought it was the fuel pump or a relay, (I have not tested yet) but low and behold, my truck started this morning and ran about 10 seconds (the check engine light was not on) before sputtering and finally dying. It would not restart. I am now leaning toward an extremely dirty engine. If the sensor allowed the fuel mixture to run rich for the last 6 months, it stands to reason that the throttle body and all other parts (fuel injectors, etc) are covered with gunk. Does this sound like the problem or could it be something else. Please give me some input so I can isolate and correct the problem. If it turns out to be dirty, what ius the best way to clean it?