My bluetooth connection with my car could be better. I occasionally hear stutter and/or distortions when I'm streaming to my car, and it happens more often if there's other apps going on. Such as when I'm using google maps navigation and streaming tunein radio. I hope 4.4.3 fixes this...
Just thought I'd mention this: I frequently listen to music in my car, but mostly podcasts. I noticed a long while back that if I started playing it on my phone BEFORE hitting the BT button in my car, the voices would be distorted and would skip ahead like 5 seconds every 30 seconds or so. However, it works perfectly fine if I hit the BT button in my car FIRST and then start playing the podcast and/or music. It's like if it's already playing on my phone before I hit BT they aren't synced up correctly and there's issues.
Not sure if that's at all what you're experiencing, but I thought I would just mention it since it sounded similar with the distortion and skipping.