Since these are your own personal mods and therefor nobody in here has experience with them I suggest you have a look at the game.log.txt right after a stutter (I understand it's just one stutter on an entire job)
On a default win10 install you can find your game.log.txt here: C:\Users\YOURNAMEHERE\Documents\Euro Truck Simulator 2
Not sure if you can just pause the game, go to windows and have a look, or if you need to close the game first, but I'd try the first
If you have the dev console enabled, just park the truck and open that, or if you want to have a live view of what's happening while playing open the dev console and type g_minicon 1
If you don't know how to access the dev console, open config.cfg and replace the "0" with a "1" in these lines:
uset g_developer "0"
uset g_console "0"
After that, when you're in the game, press the ~ key on your keyboard (this may vary, but by default it's the one i need to use on my keyboard in my language)
the dev console should pop up (do not do this while driving
Hope this was of some help, if not i hope someone else can help you
