83 GS hunting idle
 

Ok, time to tackle this issue. The idle just won't flatten out. Fluctuates consistantly. And when driving at a steady speed, it feels like
I'm coming off and on the throttle. As long as I'm accelerating, it seems to run pretty good. And it runs smoother when it is cold until warmup. Just had an issue with spark (The pickup was bad to the trailing system, replaced distributor), so I just went through the cap, rotor, plugs, wires, ignitors, coils, etc. and they are good. Something tells me it's a dreaded vacuum issue, but I don't see anything obvious. Somebody stear me in a direction! Please!

A vacuum leak will cause it to run lean, which will in turn cause it to hunt. If you've got a propane torch, just lightly crack it open till you can hear it hissing out, and point and shoot it all over. When the idle jumps up, you know where your leak is. One thing to note is, you can get a false indication when you have the aircleaner box off, vapors will get sucked into the carb and the idle will jump. So just be sure the leak is pulling it in, and not the top of the carb.

You also can use WD40 or whatever you got on hand, but again, the vapors. Use a tube when you can.

I'll be checking for vacuum leaks. I noticed that, this morning, it drove real smooth, none of the bucking, when it was cold. Once warmed up, it bucks slightly (OK enough to be annoying) when driving at a steady speed. I want this car to drive smoothly soooooo bad. Could this be a carb issue?