Not Idleing right
First off,connect something to the cigaret lighter that has 12 volts,and make sure the lighter plug in socket is working,then remove the battery cables and clean the cable ends real good,like shiny clean,and the battery post.It sounds like the alternator is having a hard time charging the battery,and the ignition system requires a lot of volts,and amps just to run,when turning the fan on,the engine revs up,this tells me it is possibly causing the alternator to put out more volts.
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