Hi Bill,
I'm working on the premise that the problem began when I installed the 'used' ignition coil/amp yesterday because that is what happened. Until I exchanged the original IC/A with that one there were no revving issues with the engine. The crank position sensor - Volvo does call it that - was replaced just last summer. At the same time all connections were cleaned. Connections have again been cleaned today.
I'm thinking that the 'used' coil/amp was faulty and somehow messed up the ECU causing the present problem.
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