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1998 mountaineer surging


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My dads suv started surging when soft accelerating but under load. It was fine on the way to our trip then the second day it started doing it. Happens when giving it gas more when climbing even small inclines, hard gassing doesnt do it, maintaining speed doesnt do it, just when described above. Did we get bad gas? v-8 engine. Any suggestions? Its surginging in a kind of what I woulddescribe as a popping manner, no noises, kinda fells like your going over small bumps, but its due to the engine loosing power for split seconds. It goes away whenwe are just maintaining speed.
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the 4.0 sohc, and dohc is known for vacuum leaks.

 

 

these , not so much. could also be a clogged fuel filter etc. have also seen poor valve seating cause random, low throttle missfires in these aswell.

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