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The first step for this problem is the fuel pump relay. Resolder it, cost nothing and takes 10 minutes. It is such a common problem rhar many Volvo owners resolder as a preventive measure.
It is difficult to diagnose such an intermittent problem unless it occurs during testing. It will be important to know if the problem is fuel or ignition related. Next time you are attempting to restart without success observe if the tach nudges up slightly during the time starter is cranking.
If it nudges up- fuel related problem
If it does not - ignition problem (no spark)
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