Like the tittle says I'm having a new problem with my 2011 5.0 . Normally when I turn the car on it idles at 1,000-1,100 then drops steadily to 800-900 but recently I check under the hood and saw a whole mess of corrosion on the positive battery post. I proceded to clean the post as best I could (disconnected the positive and cleaned it). Then I put the cable back on and we're ok and all set to go. NOW the car fluctuates idle from 600 to 800 just jumping around and when I get on the gas it drops about 100 and then climbs back up quick but when slowing down almost to a stop it drops to 3-4 hundred.
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Sent from my iPhone using Mustang Evolution