3 dash lights come on and off together: battery, ABS, yellow car with lights

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Problem occurs when A/C is running, and car is stopped at a light, or parked and idling. Sounds as if it may stall yet never has - idle is variable. Headlights dim and brighten in sync with speed of idle. This has been happening for at least a year. This week, when AC is on and idle slows, 3 dash lights come on: ABS, battery, yellow car with lights. Idles ok if I press accelerator lightly. Yesterday, it had minimal power in Drive, and made several loud pops under the hood when I pressed the accelerator. Normal once AC was off. Radiator replaced last summer.