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The OVP has no influence in spark quality. Measure the resistance of that plug wire as it should have the correct resistance stamped on it.
If that proves successful then check rotor + cap for damage or arching.
A 190 2.6 does not have a MAS. It uses an airflow potentiometer which is a very simplistic version which only influence is fuel enchrichment adaptation on acceleration. There is, however, a cold air sensor at the front of the intake. I would start with the spark issue though.
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