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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
I start my car up and it goes to about 1,500 then back down to around 6-700 at idle, if i just let it sit there it surges to around 1,300 then back down to 6-700. I popped my hood to see if I could see anything and I noticed my engine revved up higher when a pulley came on, its the very bottom right hand pulley of which I think is the p/s. Anyway how can that come on and off when it's driven by a belt that's connected to all the pulleys, should it come on and off?