6R140 surging issue

[Smokin 6.0]

Just bought a 2018 with 210k miles. Started doing this surging thing like it’s running out of fuel. I notice it more when the truck is started then drove right away. If you keep driving it but set the cruise it stops. Also it goes back to driving fine after trans hits 190ish degrees. Any ideas ?

 

[Sterling6.7]

Fluid and filter change due?

 

[Smokin 6.0]

It sure just bought it so I changed the oil. Fuel filters and trans filter and fluid about 5 minutes ago

 

[Smokin 6.0]

Sorry Not sure it it was do but did everything anyway

 

[Sterling6.7]

And survey says?

 

[Smokin 6.0]

Didn’t help. I think the accelerator position sensor is going out. If I turn the key in and push the pedal all the way down a few times before I start it seems to do the trick. Guessing the pedal needs changed