Idle Problem After Jump Start

1990 Volvo 240 wagon, standard transmissiom. After a jump start, the idle is all messed up. The engine revs up and down when trying to idle. I have seen a posting about this problem on a 940. The post suggests doing a "full reset" on the FI eelctronics by either pulling a fuse or disconnecting the battery. Should I try this on the 240? If not, what should I try?

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