What causes the engine to bog at full throttle?

There or mainly three things that can make the engine bog under load, a clogged catalytic converter, and bad MAF sensor or a weak fuel pump. Here are guides to help you figure out which one is the problem and I have included instructions on the part replacement in the images below.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Fuel Pressure, Standard Value .................... 343 kpa (3.5 kgf/sq.cm, 49.8 psi)

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

And a generic guide on how to replace the MAF sensor with the location it the images below.

https://www.2carpros.com/articles/how-to-replace-a-mass-air-flow-sensor-maf

Check out the images (below). Please let us know what you find. We are interested to see what it is.