In a large sauté pan, heat the olive oil over medium-high heat. Add the shallots and garlic and cook until they are soft, approximately 5-6 minutes. Stir in the red pepper flakes and cook for 1 minute longer. Add the sausage and cook for about 6-8 minutes longer. Add the vinegar and clams to the pan and stir. Sprinkle the parsley over the top, cover and cook until the clams have opened, approximately 8 minutes.
Discard any clams that did not open. Place in individual bowls and serve immediately.