layers missing when sliced

Gday
So I have extracted a car out of a game and put it into blender as and .obj file.
I do this buy converting the .Kn5 file from the game and convert to a .obj file
I then convert to .stl for the slicer and when looking at the layers they are missing.
The model looks fine until you check the layers with the review and it becomes apparent.
I have even tried adding a solidify modifier in blender to see if it will fill it up by thickening but same result.
wondering if anyone has had experience in doing this?
I have even played around in Fusion360 with the mesh file of the car but is has to much in the mesh. even id i do the same in Fusion 360 with the .obj file it still slices the same.

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most likely parts of the mnodel are thinner than your nozzle width. So they'll show up mwhen viewed, but not after slicing.

Try playing with it in meshmixer,

Yeah thanks thats what i have been doing with little success