I have a 73 GMC with a 250 engine and its been having issues ever since the headgasket cracked. i replaced it and it worked fine for 2 weeks after and then the trouble started like dominos. So i started looking into possible issues and i believe i have it down to the EGR system not being connected as well as NONE of the vacuum lines.... i connected all the lines according to the Chilton vacuum diagram however i cannot for the life of me locate the EGR TVS (thermal vacuum switch) and according to the diagram the EGR goes to the TVS and the TVS goes to my carb. Anyone have any idea where that is located on a 250?
