General car revving high ,low ,high ,low when idling please help

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General car revving high ,low ,high ,low when idling please help

I also had this happen on my Punto after I changed the engine and it turned out that I had no slack in the throttle cable when It was at idle and it seemed that this was messing up the idling and it rev'd high low just as you described. After I put some slack in the cable using the adjuster it fixed it straight away - might be worth a quick check it's a quick and free fix if it is this.
 
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