High Speed Stumble

[dieselmech]

While Driving Around Tonight My N/A 6.2 Was Stumbling At Hwy Speeds!!! Thought It Might Be Less Than Good Fuel Or A Plugged Filter. Swapped Out Filters, It Helped Alittle But I Could Still Feel It. Any Ideas

[DmaxMaverick]

Fuel pump, poor fuel quality or air leak. Could also be a poor ground or connection to the FSS (Fuel Shutoff Solenoid).

If it "improved" with a filter change, my guess would be a weak/failed lift pump. Did your WIF (Water In Fuel) light come on before the filter change? If so, you could have got a slug of really bad fuel.

The mechanical fuel pump should be supplying 4-7 PSI under any condition. Usually when they fail, fuel will drip from the weep hole in the pump pod. Later, it may leak fuel into the crankcase.

[dieselmech]

Thanks For The Info