Yeah I know,
an automatic Miata!?! 
Now that we all had a good laugh (at my expense).
Been trying to hunt down a rough idle on my 1995 Miata.
All new tune up, checked all hoses manifolds, everything is clean and tight.
Then on a whim I'm sitting at a stop light with her burbling as usual and I get the idea to pop it in neutral... she smoothes out...
Any ideas?