After a valve cover gasket replacement (done by someone else) I quickly noticed that when starting the car, the starter would continue to run until i removed my foot from the break pedal, the tachometer was not working (not fuse related that I can find), and the car was stuck in limp mode. In the beginning there were numerous codes that I narrowed down to a bad IBS but that has since been replaced. Among the current codes listed is 354 (Start Assist Not Active) which I have never seen before. I have no idea if all these are related but no clue where to begin looking. Any help would be much appreciated.