2000 7.3 powerloss
 

I will be driving 70 in it will drop to 50mph and have no power at all. No boost leak, no smoke, no fuel leaks, even replaced the injector controle pressure thing and still nothing need help. Also replaced fuel filter.

Have you checked the exhaust back pressure valve?

We're is the back pressure valve. I took off and cleaned the exhaust sensor one up front by the fan belt that has a metal line coming up from the exhaust manifold.

The pickup only has 94k miles on her. A lot of towing and idling is pretry much all she does.

Anyone! What could it be, not even a code is thrown.

I would start by doing a live data read with a scan tool to see what the sensors are doing when the truck is actually doing it. Start from there and see if you see any substantial changes go on during the event. If no changes, I would start looking at the lift pump and injection pressures. Also check high pressure oil pump pressure while doing this. Could be a o ring starting to fail on the injectors. How does it start? Does it long crank? A bear to get started when cold?

Maybe we are over looking the situation have you ever dropped the fuel tank and looked at the two filters that are inside your pickup. Those two little filters can get gunked up pretty quick depending on what kind of tank you have if you have a mid ship or a after axel tank the lamination inside the tank seems to separate and that gets caught up in your filters and it will be like your engine is starving for fuel. Check your fuel pressure. What should his fuel pressure be at Big Horn. Big Horn is pretty good at this .

she runs nice and smooth and starts right up. If I floor it in park it will Rev to 2600 or 2700 rpm stay their a second move a tad in then redline. She studders.. like holding back on rpm it won't just rap out instantly like she should. If you can get her to shift a gear at 50mph also she has no power to pull itself up rpms don't seem to move.

We're exactly are these screens. This model pickup has no pump inside the tank either like others do.

I have to agree with this. If you have already changed the fuel filter, seems like you either have water in your fuel or a vacum leak too me.