Q: Car hesitates or stalls before accelerating. Diagnostics test says: Bank 1 System too lean.

你好呀。Yes, a torn throttle body hose will definitely cause your concerns. Taping the boot is not a proper repair, nor will it correct the situation. The boot has to be replaced. The torn boot is allowing unmetered air into the engine and the engine computer is trying to compensate for this leak; it does not know that there is a leak, only that the O2 sensor is saying there is a lean condition. The computer will attempt to adjust anything in its power to bring the air fuel ration back to normal. This is why your check engine light is on and it has low power. Your idle air control valve is attempting to control the idle and perform a balancing act when the engine computer makes an adjustment, and vice versa: the engine computer makes an adjustment when the idle air valve makes an adjustment. This leak is also allowing unfiltered air into the engine; a bad situation that can lead to worse. I suggest having a qualified technician perform an inspection to properly confirm a diagnosis and avoid replacing unnecessary parts. Your Mechanic has several available technicians that can assist you with acheck engine light inspection。