In a glass bowl or baking dish, combine 1/2 cup oil, lime juice, tequila, tomato paste, garlic, jalapeno, salt, chili powder, and cumin. Blend well. Add chicken, cover, and marinate in refrigerator at least 6 hours or overnight.
Preheat oven to 350F.
Wrap tortillas in aluminum foil.
Bake 15 minutes while preparing fajitas. Remove chicken from marinade.
In a large, heavy skillet over medium-high heat, heat 3 Tbl oil. Add chicken and cook, stirring constantly, 5 to 7 minutes or until chicken is done.
Add bell pepper and onion and cook 3 minutes more, just until
vegetables are crisp-tender. Serve with tortillas, guacamole, sour cream, salsa,