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Probably the CPU under the driver's side kick panel as Ted said. These things are known for poor solder joints; resoldering the connector to PC board joints (or just swaping in a known good CPU) should fix it for you.
BTW, I know the OP said the bulbs are good, but did you check if all the bulbs flash when you flip on the hazard flashers? Since the turn signals & hazard flashers share the same switching circuit to blink the lights within the CPU, that's a quick & easy way to confirm your CPU is the problem.
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