My '97 Avalon XLS, 6 cyl.l. Auto. 145,000 miles, On occasion, it slightly "Percolates" as I call it, at rough idle, And while feathering the gas pedal between 20-30 mph and MAYBE again at 50 mph, sometimes but not always. It ALWAYS "Bogged" on a jack-Rabbit. Been doing this for years. otherwise, it runs fine. Taken it to the Ct. Toyota dealership several times about this. They've scoped it, road tested, checked wires and changed plugs over the years. They recognize the occurrence. They're mystified as to the cause. Do you have any clues I can give to them? I get 17-19 mpg around town, but I suspect the performance could be better.
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