Whenever I start my car and just go my car act's like it is going to shut off on me. It drives fine but when i stop at a light it does this thing the the car's rpms go down and then back up as if to stay on. What can be the cause of this how can it be fixed? I was told it's the fuel filter needs to be changed. any comments can help please.

95 contour 2.5 V6 90,000 mi
In New York
it's about 50 degrees

Thank you


95 Contour SE Champaign MODS. 9mm Ford Motor Sport Plugs