take the car to a garage, have them scan for for abs codes. yes they will charge you for this scan but its better then tossing cash at maybe's.
you can jack up each wheel lugs tight push and pull the top of the tire, if you feel play the hub is bad, while your there remove the plugs clean and put a dab of di electrical grease on the plug endsth, work them off and on a few time to work the grease in.
if all this checks out ok, get it scanned, thats all the free checks you can do with out guessing.
some how im thinking your tune has nothing to do with this problem.
