Fill a large pot with lightly salted water and bring to a rolling boil over high heat. Once the water is boiling, stir in the rotini, and return to a boil.
Cook uncovered, stirring occasionally, until the pasta has cooked through, but is still firm to the bite (about 8 minutes). Drain well in a colander.
Stir together the mayonnaise, blue cheese dressing, buffalo wing sauce, salt and pepper in a large bowl. Add the chicken, bell peppers, red onion, tomatoes, and cooked pasta. Toss to coat with the dressing.
Cover and chill at least 1 hour in the refrigerator before serving.