hi can anyone tell me what vacum lines or moduale are essential on my 86 k5 with a 305.a whole lot of them are broken or missing already and i would like to get rid of what i dont need.it has been running great with all this broken stuff but i am not sure where to draw the line. thank you

 

Does it have the air pump? If so, you need to check about emission laws where you are.

 

hi yes it still has the air pump but it was not hooked up it seems like it is seized. very minimal chance that it would ever have to be inspected here.

 

I'd GUESS one to the distributor, and one to the firewall (hvac control).

 

thanks for your help i have taken a few parts off,blocked any holes that were suckin air and it runs better than it has for a while.