Thanks an observer. Yes I was told the same thing, but other mechanics I spoke to said this probably isn't the problem as it would happen all the time. I think the rear plugs were changed back around 100K.
My next thing was to change to 98 octane as you did, to see if it made a difference. Also someone mentioned the fuel filter? Hopefully these make a difference, the plugs would then be the next thing.....and possibly the last.


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