My powerstroke has all the mechanics in my area stumped. Hopefully someone on here can help fix the problem. My 6.0 fires right up every time but won't stay idling. It will run all day if I hold it at 1000rpm or above but as soon as it get below 1000 it just shuts off. It also stalls when putting it in drive or reverse, it will move if I shift it into gear with the rpm up. Once I get it moving it runs flawlessly. Also in park it will stall if I turn the wheel or apply the brake pretty hard. Seems like something is draining the motor at an idle. Please some help

 

More info? Any codes? Oil pressure good? Do you have good fuel pressure? Good steady volts?