Chop fine the onion and sweet pepper. Cut carrots, potatoes, and chourico into bite-sized pieces. Cook split peas in water over low heat for 20-30 minutes. Add chicken broth, onion, sweet pepper, tomato sauce and chourico. Cook for one hour over medium heat until peas are soft. Add carrots, potatoes, and spaghetti and cook for 15-20 minutes until carrots and potatoes are cooked but still firm. Turn off heat and add vinegar.