This is a 86 gt auto and the cruise control doesn't work but does randomly.

When I set the cruise
it sets and holds a little then starts to slip
it drops to about 45 and stays then slips
it doesn't set
and randomly works with no issue

I have replaced all the cruise hoses so is this the canister or what ever else it could be?

I would certainly check the vacuum canister. There are very prone for developing leaks.

The Fiero Store sells replacements if you are not into trying to repair leaks with fiber glass.

http://www.fierostore.com/Product/Detail.aspx

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" DRIVE IT LIKE YOU LOVE IT"

Agree, sounds like the vacuum canister.
John

For a temporary (or permanent) fix.

Take off the vacuum tank.
Look for signs of rust. If you see any ( you probably will) try and clean the area with sand paper.
Take off the vacuum lines.
Try blowing into the ports to determine which one will have an unrestricted air flow. If both do, plug one end and apply very very low air pressure to the other and check for leaks by apply soapy water and look for bubbles.

Apply some RTV sealant to the area and allow it to dry. If you prefer fiber glass resin the area.

Retest the system

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" DRIVE IT LIKE YOU LOVE IT"