1999.5 f250 super duty 7.3 manual (p1316) HELP
 

I got rid of all my other codes but still getting P 1316 code ,I have noticed if I don't get on it hard throttle I do not throw the code or the service engine light come on but when I do get on it hard the service engine light comes on and p1316 code also notice it does come on during Idol sometimes ,service engine light that is. Any help would be great thank you very much