Ford Repair Questions? Ask a Mechanic for Answers ASAP
if you like to fix your own vehicles it may save you some money paying a Ford dealer $150 to diagnose the problem for you. other than that the there are only a few things that can cause these symptoms with setting codes and 1 is fuel
pressure but you replaced the pump already (but make sure you have at least 55 psi of fuel pressure while idling and reving the engine in park, if not reply back) fuel quality can cause it, so i would get a fuel sample in a bottle and take it to a ford dealer and have them let me know if its more that 10 percent alcohol (if its weak or contaminated you can tell that by looking at it or smelling if) next, you can remove the front 02 sensor (before the converters) and see if it runs better, if it does then you have clogged converters. lastly smell the transmission fluid, if it smell burned before the valve body replacement or after then you have will need a transmission overhaul (usually if something electrical fails in the transmission like the valve body or solenoids you'll get a check engine light, if you don't get a check engine light and there is a problem with the transmission the problem is usually clutches) replay back if you have any more question, please give a positive rating. thanks
if the problem is the spark plugs the dealer should be able to verify and be 100 percent sure if they drive it with a scan tool and when the problem occur see what the spark is doing. i'm not sure why they are guessing. if you have 100k miles and have not replaced the spark plugs then they are over due.
Yes that possible to have a weak spark that don't set a code but it will still show when looking at live misfire graphics, also there are software updates for the transmission so it did make sense to have that programmed and updated.
That what I'll do cause there there is no reason a ford dealer technician should guess if he can drive the truck and duplicate the problem you are having. Good luck I wish I could have been more helpful. Thank