does anyone know where i can find vacuum diagrams for my 90 vette. can't seem to find the whole layout in one diagram. thanks

If the service manual doesn't have what ya need, I can check Mitchel & Alldata Monday.
Anything specific you are looking for, or just a complete diagram?

thanks joel. the service manual for the 75 shows a complete vacuum diagram so you can trace the lines out and they have them for different carb setups.  on my 90 even though it is running it is not running as it should. i thought i had it narrowed down to the egr solenoid not functioning properly. have tried getting a replacement and there is a national backorder and gm has discontinued them. it felt like it was sticking and holding the egr open that is why i was going to replace it. as there is no vacuum to it with the car idling as the computer shuts the solenoid off, someone mentioned that maybe there is too much vacuum going to it. i pulled the vacuum line going to the solenoid and it shows no vacuum at all. i am trying to back trace the vacuum lines and determine where the vacuum is supposed to come from. there is another solenoid by the charcoal purge tank that a few vacuum lines go thru. to see the system laid out complete would give me a better understanding of the route the vacuum takes. the service manual for the 90 i can only find the diagrams for different components (such as the cruise control servo). hope this makes some kind of sense. thanks again for any help.