Hello my fellow MX5 owners!
I’ve been having noticing a problem with mine as of late, (1991 Eunos, 132k miles) in that the engine revs will often dip below idle-
Usually when I start the engine, it idles fine - clutch down, still fine- when I put it into gear, the revs will dip to maybe 200-300. it’s been known to happen under heavy breaking too, and the other day braking from 60mph down to 40, i put the clutch down and it stalled altogether while I was still rolling 
This morning while I was driving it, a few pieces of blue plastic/waxy material crumbled down onto my left foot, which I’ve since identified as the pedal bump stop…
So my questions are-
- could this pedal bump stop be causing my engine idle problems?
-is it a straight forward job to replace it?
Any help is muchl appreciated!