I apologize if this is a duplication.

I have an '01 Disco II with an rough idle. it sounds like it's dropping down a hundred rpms and then back up. The tach. doesn't move but the engine is definitely not running smoothly. It was throwing a code for the MAF sensor which I replaced but, the issue is still there. The CEL has not come back on yet but, we'll see. Any idea what else I might need to look at? Any help, as always, is appreciated.