What year make and model of vehicle? In some cases, when the battery is disconnected/removed, the vehicle will need an idle relearn procedure. This can usually be accomplished by keeping the vehicle running with your foot on the gas pedal and gently revving the engine til idle will stay by itself. It is then a good idea to drive the vehicle for any other module relearn that may be necessary. In some cases, the relearn procedure must be accomplished using a scan tool.
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