When it's revving but not moving forward while in gear, I would assume that your car has the same issue that I have.Also in my case I'm not having any Egear issues, mine just does the revving thing..
Have you always shifted to neutral before you rev the throttle manually?
Next time, try to rev manually while it's doing that in gear 1 ... I am pretty confident your car will rev into nowhere, without moving an inch, acting as if it was in neutral.
I am determined to catch it on video today ...