leds do weird things sometimes. i have all leds except for the rear 194s. make sure the switchbacks are in the socket the right way, they dont work right otherwise, but will sorta work.
i think you need to do the jumper mod on the fog relay for those to work right, ClubGP Message Forum troubleshooting
and if you have the alternating tail light mod you have to put it back to stock, it also messes with leds.