Loss of power after steady high speeds

[pcracer]

I have a big loss of power trying to accelerate after driving steady 70-75 mph with cruise for let's say 100 miles. If I slow a little and try to pass a car, it feels like I shut the engine off,it bucks a couple times then gains power back.It's done this 4 times. Ford says no codes and can't duplicate. I haven't noticed smoke because I'm trying not to get run over. Any ideas??
2008 F-350 King Ranch Build date 1/11/08.

[Cumminspower11]

Bucking could be fuel problems... Your problems kinda has me stumped, never heard of it before on the 08's... Good luck with it!

[work truck]

Mine is in the shop today for that and other problems. After running with the cruise on for 20 to 30 minutes, it will miss real bad if I stomp on it. Also has oil leak at the back of the motor. Also is making bad hissing/grinding noise next to the firewall when rpms are over 2200 under compression and under power. 32,000 miles, it also likes to make oil between changes. No engine warning lights ever.

[pcracer]

Can you post what they find. Hope you don't get the "cannot duplicate" runaround. My truck has 25,000 miles and I've only had it in the shop for this and DPF problems.

















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[work truck]

Called the shop yesterday, they pulled the intake and found coolant, said it has a leaking EGR. They still don't know why it misses. I guess I don't get how a leaking EGR would cause the hissing/grinding noise. I've read on here that it could be a bad flex pipe, the missing could be bad injectors. I try to share that with the service guy, but he pretty much acts insulted.