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I've seen from 500 to 1500 RPM in all the manuals I've been through, depending on the year and application (truck/car). In personal experience, 650-800 RPM is acceptable warm operation range. This will also depend on elevation. Will go up to 1200-1500 RPM for cold starting. I live at about 2000ft and my '86 Pickup 22RE idles at 725-750 like a top after about a 3-4 min warm up @ 1250 RPM if it's cold (<45ish).
A high idle is caused by either a massive vacuum leak or a sticking idle speed control valve. I would think you have a vacuum leak, use a can of carb spray and shot around the top[ of the engine, if you hit a leak the engine will sound different, repair as needed.
clean out the throttle body if did nit do it other than that if you used the same old MAF or mass air flow adjust it why it was set for the old condition truck engine also there is a idle up on the throttle body make sure that gasket o ring are not torn then find the idle control its either a black knob or white adjust the idle setting and you will be good again
YOU NEED TO ADJUST IDLE SPEED TO 750 RPM FOR THE 2.4L ENGINE AND THE 3.0L ENGINE IDLE SPEED NEEDS TO BE 800 RPM.THAT IS THE REASON WHY TRUCK STALLING YOU NEED REALLY TUNE UP ENGINE THEN ADJUST IDLE SPEED.
your throttle position sensor might me bad or out of adjustment. if it is out of adjustment then it can misfire all the way up to 3500 rpm. i had a friend that had a miss fire at 2500 rpm. i adjusted the tpss right and the misfire went away. Check for engine codes by jumping TE1 and E1. Your fuel filter may be dirty and restricting fuel to your injectors. have your fuel pressure checked.