MAF/VAF Circuit Input High - 1997 Volvo 960 - Cause?

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Sep 13, 2007
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My 1997 Volvo 960 occasionally has a very "hard" miss at idle, that sometimes will shut the engine down. The engine starts again immediately. There are no symptoms other than at idle. The ODB2 code is P0103. Any ideas on what is malfunctioning?

Thanks for your assistance.