1994 Mustang GT, idoling, problem

[five.point.ohhh]

Okay, first of all thanks for atleast looking at my problem hehe

I own a 1994 mustang GT

Starting yesterday, my car will not go above 3000 RPM's.

I start out below 500 rpms (when sitting at a red light etc etc)
and then when i try to accelorate, my car WILL NOT go above 3000 rpm's and thats not even saying it stays at 3000, it will randomly go from 3000, to 2500, to 1500, back to 3000. I have no idea what this can be. My friend said it may be my fuel filter? Anyways...any help would be greatly appreciated.

Thanks
-nick