This randomized phase III trial is studying how well standard chemotherapy (vincristine, dactinomycin, cyclophosphamide, and irinotecan) works compared to combination chemotherapy combined with temsirolimus (new agent) in treating patients with rhabdomyosarcoma (cancer that forms in the soft tissues, such as muscle) in patients with intermediate risk rhabdomyosarcoma. Are you Eligible? (Inclusion Criteria) Less than 21 years old at the time of study entry. Newly diagnosed with intermediate risk rhabdomyosarcoma. Patients can not have received any chemotherapy (excluding steroids) and/or...