Vehicle stuck on ground

[M0ajod_1 (Majd Shikh)]

hello

i have proplem with vehicle setup
car freeze in ground or glitching on the air

this video show you my issue

i have rigged my vehicle using this tutroial

How to rig vehicle in Blender 2.8 for UE4 [No Sound] | Blender 2.8, Unreal Engine 4