Possible ECM trouble

I believe my ECM is going bad, but I am not sure. I have multiple things wrong with my car. So to start off my main problem is the fans do not work unless the air conditioner or defrost is on. I can also unplug the coolant temperature sensor and they will come on so we replaced it and they still will not come on without the air conditioner or defrost running. My next problem is when cranking the car it will not crank and stay running unless I pat the gas just a little bit. Sometimes my ABS and brake light will also come on when I crank it but the next time a crank it their off. Sometimes my radio will show "locked" when I crank it and I cannot adjust the volume or channel unless I switch the car off then back on. My mechanic believes it is the computer and I would just like for another opinion.
(Please excuse my rambling post I am no mechanic)