Cruise messed up

[Russell]

Hey guys, I was driving home tonight, and decided to put the truck on cruise (fixed the cruise leak at the brake pedal) anyways, I hit the button, and the servo sucked my throttle to WOT, and it kept accelerating till I finally hit the brake once it hit about 80 mph... Any idea why it'd do that? I was already going about 70 mph, but yeah, it wasn't planning on stopping, lol, and my engine really didn't like that much gas either, (truck has some MAJOR carb issues right now, it'll literally die if you hit the gas when it is cold) and was belching blue smoke out, lol