Jerking / Surge when decel or maintaining speed with light pressure

[Kingralph88]

I recently just got my truck back from the mechanic, I had a bad rear output seal leaking oil into my overdrive unit. It since has been fixed.

I am noticing a decrease in power and a jerking / surging motion or almost like my pedal is not opening to send fuel. I want to say there is air intrusion from somewhere on the low pressure side?

I have a couple of videos I’ll share as well.
At one point I am literally pedal to the metal and loosing speed (rpm’s don’t work in video).

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[IDIBOBS]

Many possibilities but there is not high and “low side”. The fuel is just an open (more fuel) and close (less fuel) valve operated by your throttle pedal. This could be air intrusion, bad lift pump, bad injection pump, or even something in the transmission.

 

[DirtyWood]

Was everything fine before the recent repair?

 

[Kingralph88]

Was everything fine before the recent repair?

I want to say yes, I replaced my glowplugs right before I dropped it at the mechanics, I want to say I felt something weird happening like this while driving to the mechanics

I don’t think they caused it.

 

[Kingralph88]

Many possibilities but there is not high and “low side”. The fuel is just an open (more fuel) and close (less fuel) valve operated by your throttle pedal. This could be air intrusion, bad lift pump, bad injection pump, or even something in the transmission.

Is there anything I should test fuel wise that can give me an answer to either a problem or not a problem?