Hey Scotty I have a 2008 Ford Edge that has a rough idle rpms go up and down trying to stall wats da problem and also while I’m driving sometimes I hear a loud metal scraping noise dat gets louder when I’m coming to a stop wats da problem has 171000 miles

metal scraping, if from the engine, means time for a new engine. If that's the case, get rid of it FAST

So wat about da rough idle wats wrong rpms go up and down