2005 Cadillac CTS Problems when accelerating

Recently I have been experiencing a few problems while accelerating. At random times when I accelerate my car will start braking. When I press the gas pedal I can feel the brakes activating and if I push the brakes during this time I feel them pulsating as if the antilock brakes has activated. The only thing I can do is allow the vehicle to brake itself before I am able to accelerate again. I had the codes read and came up with a misfire code (P300 and P305) and a loss of communication with pcm code that has "abs" in the corner of the screen that code is U1016. Sometimes the car jerky or stalls a bit while driving maybe because of the misfire I'm guessing. But the big problem is the brake while driving issue.