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I'll assume you have a non-turbo with Rex-Regina engine controls....
Take the coil pack apart and clean the internal contacts and all mating surfaces including the unit's contact with chassis ground. It doesn't cost anything to do this and it's a known source of ignition problems on these cars.
Also consider the Crank Position Sensor (alias RPM sensor) may be going bad. Reading out the error codes via the OBD display may give hints of this. The instructions are in the the 700/900 FAQs if you've not done it before.
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