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I have a Mazda 323 1990 and the same problem. So far (as well as a full service) no-one has been able to diagnose but I have found someone on the web with similar problems and they advised that it could be the Coolant Temperature senosr or the oxygen sensor. The former can be tested with a scan tool and by comparing actual ambient air temp and the reading the CTS is giving. It should be within 2/3 degrees of each other. I understand the OS cannot be tested. If there is a problem the CTS needs to be changed.

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