My factory original cruise control on my 82 El Camino still works but has a very annoying surge problem.
Example: If I set it to cruise at, say, 65 MPH, it will pretty much maintain that speed but CONSTANTLY accelerate for a second or two and then let off for a second or two. Bugs the heck out of me!! :mad: What causes it to do this?
Is there something I can do to prevent or repair this problem? Thanks for any help you can provide!

Sounds like a vacuum leak. Most likely, It's the diaphram.

I'm not sure if they still used a vacuum dump valve located next to the brake light switch. If the plunger isn't fully seated you'll get surging.