Default bluetooth issues

no DE moto x, rooted on 4.4, having issues with bluetooth, while on a call outside the car, and going into the car, as soon as the phone call transfers to the cars bluetooth, it drops the call. also, i have the verizon tethering hack, and when tethering is on, there is alot of static on the cars bluetooth. NONE OF THESE ISSUES EXISTED on 4.2.2, rooted with the verizon hack too.
any advice, maybe somehow loading 4.2.2 bluetooth files on 4.4? how do i do that? any advice will be appriciated. TIA