Just a quick qurstion to do with my 3.9 88 Fairlane.

She is running a little rough at the moment and I'm not sure why so any help would be appreciated.

The problem is as I'm driving along ( eg. Freeway driving )
It'll suddenly seem to have a loss of engine power (revs drop etc) and then continues on after about 2 seconds like nothing happened.

It's started to become a more common occurrence so any help would be greatly appreciated!