I have a 2006 f250 superduty crew cab longbed with the v10 gas motor. it has 201000 miles on it and towed great up until last month. i was towing a 5000lb trailer down the interstate at around 68mph,suddenly it was like the drive train disengaged and the motor had nothing left, check engine light on but no overheat condition or lack of oil pressure. we put a new fuel filter and pump on and maf, took trailer out again and same problem, pulled to the side and turned off, immediately restarted and ran fine. it did the same thing 8 more times that day, shop is at a loss , any help would be greatly appreciated!it has a cat not cleaning code in it now!

 

How is the exhaust flow coming out of the tailpipe, especially at load? You could have one or two bad converters which are restricting flow, heating up and causing the engine to go into limp mode.

 

exhaust seems fine, truck fires right up after you pull over and turn it off, something resets immediately when i restart, after it lets loose under hard acceleration the engine runs very rough and the accelerator pedal is unresponsive.

 

clogged cat will do that. any rotten egg smells? if yes..run some cat cleaner thru the gas

 

Don't guess, don't waste your money replacing good parts hoping you stumble onto the issue. Have the truck scanned. You have a CEL, so there will be at least one error code.

 

truck was scanned, says passenger side cat going bad, ford says that should not be causing this problem, in limp mode does the truck idle rough and become unresponsive to acceleration?

 

ok new info, while going around a curve today i accidently knocked shift into neutral, while vin neutral tried to accelerate but pedal felt like it does when truck messes up towing, went to shop aand checked with mechanic and he said truck has a rev limiter for park and neutral!!!!!! what is the possibility the truck is shifting to neutral under load and going into rev limit? i think this may be a tranny electrical problem and not engine, what do you guys think?

 

If it went into neutral under load then your truck would just rev and not go anywhere, not slowly accelerate like in limp mode. So none whatsoever.

 

thats what its doing, i have to drift to the side of the road and turn off then back on to get going again,

 

I see that now. I didn't see the disengaged part at first, just the part about limp mode and not having anything left. There is a rev limiter on these engines, but not until around 6,000 rpm. So if it is popping into neutral it should still be able to rev normally.

 

when i am in park or neutral it will not rev past 3000 rpms, put in gear and its fine?

 

Have the MLPS sensor checked?

 

You have a bad catalytic converter. Yes, it will cause these issues.

 

new cat to be installed friday, will let you guys know what happens! thx

 

X10. You have a code related to exhaust, so you had to take care of that before anything else could really be considered. I bet the cat (or some O2 sensors) clears it up for you.