What might cause my turn signals to work intermittently?

The most likely cause is usually a bad flasher relay I posted a diagram of where it is.I also posted a trouble tree for turn signal inop. Here is how you change the flasher in case that's what is wrong.
HAZARD AND TURN SIGNAL FLASHER REPLACEMENT

REMOVAL PROCEDURE

1. Remove the hazard and turn signal flasher module (1) from the brake pedal bracket (3).
2. Disconnect the electrical connector (2) from the flasher module (1).
3. Remove the flasher module (1) from the vehicle if required.

INSTALLATION PROCEDURE

1. Connect the electrical connector (2) to the flasher module (1).
2. Install the flasher module (1) to the brake pedal bracket (3).
3. Press the flasher module (1) until the rosebud retainer is secured to the brake pedal bracket (3).