Cook pasta in salted water according to package instructions; drain.
While pasta cooks, cook sausage in a large nonstick skillet over medium-high heat, stirring to break into bite-sized pieces, until cooked through, 5 to 7 minutes. Transfer to a plate lined with paper towels. Discard drippings.
Add 2 tablespoons oil to skillet, stirring and scraping to loosen browned bits from bottom of skillet. Add peppers, and cook, stirring occasionally, 3 minutes. Stir in vinegar, garlic and salt; cook 1 minute. Stir in cooked pasta, sausage and remaining olive oil until pasta is coated. Stir in Italian seasoning.
Serve with Parmesan cheese and freshly chopped parsley, as desired.