Where can I find a vacuum diahgram for a 350 TPI? I ve looked in a Haynes manual that was in the car when I bought it but it doesnt list one for a TPI engine. Unless I missing it.

 

There is no substitute for the proper tools.
Haynes, and Chiltons manuals are both just starting points. They're not good for much of anything. Buy a GM/Helm shop manual for your year vehical and learn how to use it. The one time investment will save you headaches and money over the long term. Check Ebay, you can usually find the right manual for $20-50 used.

 

What exactly is that manual. Ive never heard of it.

 

The ones that Helm printed for GM that they use at the dealership when you take the car in and pay $50/hr labor.

Here's one on ebay, though the price is rediculously high...
http://cgi.ebay.com/ebaymotors/1987-...spagenameZWDVW

Or you can order one directly from Helm...
http://www.helminc.com/helm/product2...1VKA697TERF3S3

Dig around a little and you should be able to find a used manual for $20-40. It's also something you might find at a swapmeet, or in the corner of your local Chevrolet dealership.