idle

so here goes, looking for some help to figure this out. my original 2008 2.3 duratec lost all oil and gave out at 249,012 miles, a friend installed a 2010 junkyard engine with 81,000. now when I start the engine it idles at about 2100 rpm and warms up, it idles bak around 950. When driving and...

$500 ranger? Yes Please! No vacuum lines? I can figure that out! no i cant please help its been 3 weeks i dont even know what i dont even know. The 2.3 starts and idles low then climbs high, drops and dies. Rinse and repeat a few times and the thing will eventually even it self out and runs...