Miata Mailing List: March 1993, Message #33
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   From: (none)
Subject: Re: RPM drop at stops.
   Date: (none)

Kris:

I have a 1990 Miata and have had no problems with the idle dropping to
300 to 400 rpm when stopping.  Is the clutch fully depressed when you
stop?  If not the rpm will drop below idle speed.  Also, if you have
power steering there is a slight reduction in rpm when sitting at idle
if you turn the wheel but it rapidly returns to about 800 rpm.  I
would be concerned about a faulty computer or sensor.  Also as
suggested, your idle might be slightly low and if you can raise it
slightly the problem might not be significant.  In any case if your
car is under waranty you should have the dealer resolve the problem.

Herb Samuels