So I just got a 2002 Ford Windstar and haven't had any issues until now. Just recently I had to replace the wheel bearing, the ball joint, and the brake rotors on the driver side, and I have yet to do so on the passenger side because "they're shot". My question is: When I accelerate, my RPM's go up like normal, but when it's trying to shift again while maintaining speed, it sounds like it's shifting all the way down, and sometimes it's rough. I'm not getting high RPM's, rather low (1400 RPM going ~55). My car sounds like it's not running when you are parked, and when you're at a complete stop it sounds like it's not running and the RPM's are ~800. Tranny fluid looks okay and oil is a bit low, going to do the oil in a few hours. I'd appreciate the help.

If this helps at all:
When I have my headlights on and roll down a window, they dim until I let go.
When I have my USB charger plugged in, radio gets static.
Not sure of last oil change
Not sure about the transmission
~191,000 miles.
When fueling up, I get blowback.
You can hear it hum when shifting.

Please give me your input.