Ok yea thats what mine does only now and then though. My old man thought the same as you. At least thats 1 thing of my mind weird how some days does it and some it dosnt
Just need to sort the lumpy starting issue out now as thats bugging me
Now and then when i start it it runs abit lumpy for abit then sorts its self out and is fine whole car shakes only does it for like 4seconds or so