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2000 S70 ~ starts with great difficulty after removing gas cap to refuel. Tried to fill up without shutting off engine, but this causes the engine to falter when gas cap is removed.
 

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taking the gas cap off with the engine running will likely cause problems leading to the engine management thinking there is an evap purge failure, and maybe dropping the engine into limp home mode
 

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i am not certain exactly, but the evap purge sucks vapor from the tank, so a loss of the suction pressure would trip a fault code in the evap system(though maybe not the check engine light). there is always the possibility that the symptoms are caused by a totally unrelated fault.
 
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