Idle issues - cable/advance weights/choke??

I'm having idle issues with my '88 2001 and I need your help. I've done a lot of searching on the site and there are 3 things I want to look into...but, I don't know exactly what I'm looking at/for.

Idle issue: after initial start up and warm up, it idles nicely at ~650RMP. After running around 25 or so and back to neutral, the idle will stay at ~1000RM...shut down and wait a bit and it will return to ~750RPM. Shut down for about 30 minutes and it takes a little throttle to start and will idle < 500RPM in FWD...if i give it a little throttle to ~750 and then back to idle position in FWD it will stay around 650RPM.

For both the high and low idle issues, I want to first make sure the cable is adjusted propely at the carb. I previously found a good topic...but, can't find it again. Can anyone point me to that post or give me a quick how to??

For the high idle, I suspect sticky advance weights (tried to manually close the secondaries with no effect). I am not very familiar with distributors so I don't know exactly where the weights are. I checked the engine manual...but, not so clear. Does anyone have a good photo of where the weights are and some good advice on how to "un-stick" them?? I have a prestolite distributor that has been converted to EI by the PO.

For the low idle after sitting a bit I think maybe the choke is closing and shouldn't be?? This should be easy to check by removing the flame arrestor. If this is the case, do I need a new choke??

Sorry for the long post. Any advice is greatly appreciated.

SNOB
I wished I would have seen your post three days ago. A vacuum issue may have been my problem. I noticed when I was removing my carb on Wednesday, the (4) mounting bolts were not very tight. The gasket hardly had an imprint of the carb.
I'm still glad I had the rebuild done, the guy said the carb was in rough shape. I looked at some of the parts that came out, and they were bad.

Where are you guys buying advance springs and don't forget you're supposed to reset the "air gap" on the EI plate when reinstalling it.

Hollywood I had to get my springs through a local speed shop. I searched all around for the stock ones that came out of the original Mallory on ours (BBC) to no avail. The ones that got put back in were the closest I could find. I believe they are just a pair out of a larger kit you can buy that has multiple springs to customize your advance curve. We selected the closest to stock and it runs great. He charged me $5 for the pair.

I finally got around to buying a timing light and checking the timing at normal idle (~600RPM) and at my "high" idle after running hard (~1000RPM). the timing is right at 10 deg. BTDC in both cases so I don't think I have an advance weights issue. Any good ideas on what to check next?? I think i'll take the carb cleaner with me next time and see if I can find any leaks.