A month ago I replaced my valve cover gaskets and then a week later my 2003 CTS wouldn't start after driving it for a while. I read a P0335 code (CKP Sensor A Circuit Performance) and like many others on these forums, replaced the CKP Sensor. About 3 weeks later, my car turns off while driving 45 mph. I did read a P0336 code as titled in the thread. Anyone get these issues going through similar repairs?