1988 Cadillac Other

1988 cadillac Coupe deville 4.5L V8 rebuilt Cadillac engine. I looked on the site and found the error code sequence. I pushed the off and warmer buttons and the cpu read e27, e52, ee. 27. 7.0; what do these codes indicate? I had been experiencing electrical issues when I apply the break at stop signs and lights. The speedometer waves, headlights flicker, radio resets and turns off, and the car stalls. Just recently I replaced the ignition switch and wire harness. The problems seemed to be fixed until I turned the car off and when I turned it back on it all started again. Do I need a break switch or a power break booster w/ master cylinder? Or is it something else wrong?
October 7, 2006.

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