The purpose of this study is to determine whether a one-time intracoronary infusion of Ad5FGF-4 is effective in reducing the time to onset myocardial ischemia as measured by exercise treadmill testing and improving myocardial blood flow as measured by SPECT imaging. Exercise capacity, angina functional class, patient symptoms and quality of life will also be evaluated to characterize the efficacy of Ad5FGF-4. Short-term and long-term safety of Ad5FGF-4 will also be evaluated.