abs light keeps coming on and off
a couple of days ago while accelerating to about 40mph while getting on the highway the ABS light came on.It stayed on til as I was exiting the highway and applied the brake.Then it came back on.After parking the car for about 2 hrs the light was off when I started to leave.It came on again for a short while and then off.Sometimes it stays on longer even though I've not gone over 45mph.Then it comes on when I get in and its the first start of the day.I went to Firestone and they attempted to check the ABS module but said that it would not communicate with there computor.The other modules did respond and so they said that I should take it to the dealer.Know this will probably be a big bill.Any ideas before I go that direction.Thanks