Bad shutter valve. This will soon cause you to have a poor idle 
and perhaps some driveability problems. Just looked at a
PRISTINE '83 RX-7 for a local mechanic here  two days ago, 
49,000 miles, it had the very same problem. Mazdatrix has a good
write-up on their FAQ page regarding repair.

Jon Lauter
Rotary Power Marine Corporation
516-656-5685

Thanks Jon for the excellent service. Mine has only 70,000 miles.
Paul Lamar
 
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