Chrysler surging

I recently drove from bunbury WA to karratha WA in my 1996 chrysler neon and about 400km out of karratha my car started surging, its mainly at low revs, I have since taken it to a mecanic and had it serviced, and he couldnt see the problem, I have been told maybe its the fuel filter, but my car has a fuel accumilator, and its says on thhe part not to service the part. If any one has any ideas/ answers it would be very appreciated. :)