I think you could have water in your fuel tank - I had the same problem in my old Mazda 626. Water sits in the bottom of the tank - that is why you notice the problem when low on fuel. You can try pouring 500ml of methhylated spirits into your fuel tank and putting in fresh fuel. The meth spirits absorbs the water and then is burnt. You may also need a new fuel filter but try the meth spirits first. It worked for me.
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