I did a cursory “search” and did not see an answer but this forum has strong knowledge so here goes. On my ‘88 GTA, my cruise will set and sometimes hood but often loses speed. Any ideas what to start with?

 

I'd start with the vacuum lines. Need good vacuum from the storage "ball" and the bigger line back to the brake switch too.

 

Thanks @tom3 I will go through and replace the lines and see where that takes me.

 

A follow up, I found that the vac line to the vacuum reservoir ball was not even connected. I ended up replacing the lines to the cruise servo and viola! Cruise works! Making ground on this old Bird. Its been neglected but like a phoenix is rising.