02 GT Engine Miss at 70mph

Seems like the engine has a miss at highway speeds. rpm will drop about 400rpm. Miss is intermittant. Miss occurs under all conditions hot, cold, wet, dry. I was leaning towards fuel pump, but think problem might be ignition related also. Anyone experience this problem?
-Neil

Sounds like maybe your fuel filters needing changed.

Has it ever been changed?
How old are your plugs and wires?

I/d start with some of the cheaper stuff, before you spend major cash on a new fuel pump.
Not to mention the FP is a pita to change.