In a medium bowl, combine the parsley, cilantro, olive oil, red wine vinegar, garlic, red pepper flakes, salt, and black pepper to make the chimichurri sauce. Mix well and set aside.
In a large skillet over medium heat, add the shrimp and cook for about 2-3 minutes on each side, or until they turn pink and opaque.
Remove the skillet from heat and pour half of the chimichurri sauce over the cooked shrimp, tossing to coat.
Warm the corn tortillas in a dry skillet or microwave until pliable.
To assemble the tacos, place a few shrimp on each tortilla, top with sliced avocado and shredded cabbage, and drizzle with additional chimichurri sauce.
Serve with lime wedges on the side for squeezing over the tacos.