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I also have a Echo and would suggest:
Air filter, spark plugs. If it is still sluggish I would then replace the upstream 02 sensor. The fuel filter is apparently lifetime so it should be okay.
good day,first of all you may ask the owner if he has the service manual so you can change the last timing belt changed. secondly you may try to check the belt itself if it has some tiny cracks or a little loose or a little worn. hope this helps, have a nice day
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