[mickey356]

I ever since I had the co adjusted to pass inspection (5 months ago) I've had a tiny bit of idle hunting when I start the car. It starts and goes right to idle at 950 and after 15 secs it'll go up and down from 950 to 1150 for about 5 secs and then back to 950. I never thought it was a big deal.
The night before last I left work and all of a sudden a huge surge from 1800 down to the bottom almost stalling, gen light lighting up, etc... and the warmer the engine got it didn't help. The next morning same thing so I swing by my buddies garage and we hook up the smoker to check for any obvious leaks, none. I start it up and the surging/hunting had stopped. All day yesterday with no problems. Today it started hunting again but not as bad as the other day but enough (400-1200 and back) then it would level out at 950.
I did the forum search but don't know where to start. Since there wasn't any smoke can I rule out vacuum leaks? Is it something as simple as a mixture adjustment? If so, how can the mixture get so far out of whack without making adjustments? What things should I be asking for when I take this in to find the problem?
Thanks

(FYI - 83 SC w/3.0 with cat bypass and no o2 sensor hooked up. )