Hey yall, first time poster here but I've been throwing wrenches at the wall over this dang truck. We got a fleet 06 F250 with the V10, truck starts up then will slowly start to stall until it cuts out. Doesn't matter if you're in gear or parked. When it fails it just starts throwing codes at everything from errors in MAS, TBS, CHT, PCV heater with all kinds of "out of range" type messages. I've watched these sensors in my scanner on live data and while they are fluxing, I don't know if these are the root issue or an effect of the actual problem. I also tested the sensors with a multimeter where possible and couldn't find any lack of power or signal. I did replace the fuel filter because it needed to be done years ago and the PCV(and head cover) since it was mismatched and also needed to be replaced. Not quite where to go as I'm an "OTJ trainie" and our master tech has been awol for over a month. I've been trying to figure it out myself and learn along the way but at this point I'm not too sure. General background info that maybe relevant is that the engine has been rebuilt about 7 years ago after an eager beaver decided that we are running a freshwater fleet and drove it into a river. Truck has had this stalling at idle, since this rebuild. Any tips or guidance would be appreciated!

 

Check fuel pressure as you're cranking it to start and follow it until the engine dies again---that's always the first step anyway.

Good luck with this!