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????