general problems of the 1999 GMC Yukon

Had to stop in a hurry on the freeway and was going about 60 miles an hour and hit the brakes, I believe the abs locked up and I fishtailed from the left to the right and back to the left again. Engine shutoff automatically and check engine light came on. This nearly caused a multi car collision with a possible bridge fly away as we were on a bridge at the time. Luckily through defensive driving was able to gain control of the vehicle and keep it from hitting anything or anyone, however now when turning right or left there is a squeak at every rotation when going slow. Also the vehicle slowly hesitates coming to a stop and abs will sometimes start engaging causing near collisions.