All my bulbs are good and I can't figure out why my left side wont blink. The tailights work but not the brake lights or turn signal on the left side.

By the way, I do have sequential taillights and the connections seem to be good.

 

I'm not sure about your brake light but if the turn signal is not blinking it's probably the flasher. When mine quit working the turn signal was on but it didn't blink. The flasher is only 2.99 at AutoZone, just give it a try...

 

More than likely it's one of your sequential modules gone bad if the brakes and turn signal have gone bad on just one side. Swap the modules and see if the problem moves.