low rpm hesitation

I have some problems. my car when accelerating hesitates in the low rpm range, but if i rev to higher rpms the hesitation stops. it doesn't do it all the time just every once in a while. if you know anything i could do to help the situation drop me a few lines. thanks.

have you checked the fuel filter or the timing

thanks man i will check my fuel filter. my timing is okay. i hope that will fix the problem.