Guess what ?
Since I had not tuned up my xterra I needed to do this anyway...
Piece by pice I replaced...Plugs...Distributor Cap....Rotor....
Check Engine Light Still glowed...With Knock sensor code....
I then proceeded to change the wires....Bingo !!! Reset code...
No more rough ride...No more light !!! I could not believe it..
But its true...Spark plug wire caused all this problem...At 125K miles...
Rob
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