My Scooter slows waaaay down to almost stop, then goes, then slows, then goes. Speed dial d/n seem to make any difference? Does this even with batteries changed out to new?

Sounds like a throttle pot fault (the part that the throttle lever is attached to). This would need testing at a dealer or with a volt meter (set to ohm's) and if found to be faulty, will need replacing. If you test it yourself, there is usually a number on the top of the pot, usually 5k or 20k and this is what you need to set your meter too. Place the probes from the volt meter, black onto the centre wire and red onto either of the other wires (there should be 3) and slowly press the throttle lever first forward, then reverse, and constantly keep an eye on the reading from the volt meter. The reading should go up to approx. the number on the top of the pot, i.e. a 5k pot should read about 4.9 to 5.1 ish on the meter. If this number fluctuates up or down quite rapidly while the lever is held in a static position, it will indicate a faulty pot. This is in fact a common fault with nearly all makes and models of scooter and usually a fairly cheap and quick repair.