May 25, 2004My new `94 yota has a problem... a very annoying one. When I have the A/C on and I apply my brakes, the engine starts jumping in and out of idle. The sound is still in my head.... vroom...bahh...vroom..bahh! As soon as I remove the brake or turn off a/c, it idles normal. I can't downshift and brake at the same time or the truck hops around. I thought it was the booster, but I checked it, so it has to be electrical...especially because its only with the a/c on.