Abs light goes on and off?

AnswerIt usually means that there is a problem with the Anti-Lock brake system. If the light is on or flashing when you're driving it means that you're onboard ABS computer has stored a fault code. You'll need to find an ABS code reader.

And this might not help you -)

Have exactly the same problems as yours -) Always start with REPLACING the car BATTERY!

Clean the speed sensors!

And only afterwards go for a Computer Diagnosis!