Idle Concern?, 7AFE Idle Woes Options

[Hazmat]

Ok so I'm just now bringing myself to making a topic on this as its starting to show its ugly side again. I've got some weird idling problem going on as far as I can tell. Basically when the car is at normal operating temp and in neutral my idle will sometimes drop below 600 (probably like 580 or so) and everything will feel real rough and the car will Phsycially feel and sound real choppy like it wants to die but does not. This problem has shown its face on several occasions on random days (2 days in a row now) and the car will run crappy. Also want to say when it does do this I also notice that my gas pedal kinda loses its response. I feel like I have to mash down more on it than when its idling right below 1k.

Any information that could possibly point to my problem? The engine is rebuilt with about I would say 10k+ or so miles on it with new plugs/wires/distributor when the engine was rebuilt. I am currently left in a cloud of confusion over it all . I can also add any information I may have left out.

Thanks in advance

-Hazmat

[Hazmat]

Well this will be the 4th day now that it has run crappy. I'll be taking it in on a free day from work but I'm still curious if I may be missing something? I still feel like its a vac leak somewhere in the system but I don't hear any audible hissing or such. Would a very small vac leak still cause this type of issue regardless of showing its hissing side? Also on a offtopic note what is the normal idle for a 7AFE without Lights/AC On? (seeing as having the A/C and or Lights on bumps the idle up a tad) I want to say just below 1k like 900 or so but if anyone has the definite answer I do appreciate it.