ABS light and Engine Ticking, Please Help

Hello, I have a 95 z24 that i jsut bought and the ABS light only goes off when the car is just started, but when i start to drive it turns back on, any clue what this could be? and there is a ticking in the engine, when i am idling it almost sounds like a slap, and when i accelerate it gets faster. please help.

Wheel speed sensor and noisy lifter(s) respectively.

im also sure that the ticking noise is just a lifter, its nothing to serious, i drove a car for 2 years with that problem and at the end, it drove just like it did the day i got it, i wouldnt worry about it