I really appreciate everyone's input on this issue and in hindsight I should have been more specific. My tach doesn't really jump around, a few times it has read wrong, maybe 500-800rpm off and when it did this it also seemed sluggish or a little jittery.

Anyway, for the moment it's working normal for the most part and the car is not only running fine, as it always has been, but starts better since I replaced the fuel filter. My point is because the weather sucks and I don't have the money for any new parts (not that I'm convinced I need new parts)at the moment I'm going to put it off until the ambient is 50 or above.