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challenge Xtreme 1800 upright high presure washer?

I have had my pressure washer for 18months,i have used it 5 times,when I went to use it today it was ok for a while then it started to "Hunt "i have cleaned all the pipes?filters but it still does not work as it should because the water pressure go up and down.
can you help me
Thank You
MR AC O`Meara, July 2010
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