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It isn't the flasher because it works ok on the right side. The flasher works on the lamp current through it, the more current, the faster it flashes. You have one or more lamps not lit on the left side of the car. Turn on the left turn signal and look at the turn signal lamps, one isn't on or is very dim. Don't forget the front side lamp.
From: 1984 crossfire, Alhaurin de la Torre Malaga, Spain
I had the same. The ground in the front blinker light at the hood was bad, I foud it by moving the wires that go into the lights. Suddenly the blinker started to work and the brightness increaed considerably.