Why does my cars check engine light blink and TCS off light comes on often?

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The check engine light blinks almost immediately to turning it on. The TCS OFF light comes on often and car becomes hard to control in steering wheel and runs even worse then it was with just the check engine light blinking. brakes have locked up and then began pumping. has hardly no power sometimes. other times it runs great. This all started after a friend did a simple brake job? please help......thx diagnostic code read was: misfire cylinder six