05 toy high 6 changed val cov gask eng light , VSC, and Trac came on. ??????

Hello, it sounds like there may be something along the way that was inadvertently disconnected. You can retrace the steps of the repair performed to validate all harnesses are connected as proper. A diagnostic tool can determine the diagnostic trouble codes set in the processors to narrow down what area to look in. Of course, there's a random chance it's a new concern, so testing will reveal that also.