U0121 Lost Communication With Anti-Lock Brake System (ABS) Control Module

Question

Hi,

I have these errors when i went for a check on my cars problem. Engine light goes on and off, 2 days on and 3 days off sometimes vice versa. When the light is on the acceleration is good and my car is running ok but when the light is off my car runs slow and the rpm is high. Sometimes the engines stops running or turns off. I went to the technician already and they don't know what to do. They had replaced the spark plugs, fule filter, accelerator cable and fuel injector as well.

 

Please help me how to find solutions for this.

 

Thanks in advance.