On the tbi 350 motors there is a tube going from the drivers side valve cover to the back of the throttle body. Mine broke and when I try to explain what I need to the guys at autozone they look at me like im stupid. Can I run the motor without it because I plan on finishing installing the motor in the morning and would like to see if it runs.

 

do you have pictures?

 

On vac line in my driver side valve cover is the line to the PCV valve. But thats not behind the TB...

 

Then ours are opposite my pcv is on the passenger side but I found out its a breather tube, and I was able to rig something up with some vac hose and a piece of the broke tube to make is work.