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Thanks for the replies, so update, today I tried messing with the choke, I used a paperclip to hold it in place (I'm thinking it could be an issue with the auto choke system), which fixed the problem where it would idle too high, but it still intermittently drops down. It does have a fast idle screw and an idle speed screw, but it was working perfectly before and I haven't touched them, so i don't think those could be the issue. When it does idle too low, holding the choke slightly closed brings it back up. Could be an issue with the fast idle cam. One of my other ideas is that it could be a vacuum leak in one of the vacuum systems, like the hot idle compensator, so the vacuum leak only happens when that system is active, but this seems unlikely. If anyone has other ideas, I just wanted to check all other possibilities before I do a carb rebuild. Thanks,

Hi guys, as the title implies, on my 4ac, it starts up fine when cold but idles high, around 1500rpm, and adjusting the idle speed screw doesn't change anything. Also intermittently the idle drops to 500-600rpm and will stall if it's not in neutral (automatic) (maybe running too lean?). I took off the air cleaner, sprayed some carby cleaner, and checked for vacuum leaks, but it didn't help, the fuel filter is clean and I haven't had any problems with the fuel pump before. This problem hasn't happened before (in the past 4 months), it only started a couple weeks back after the engine shut off and wouldn't start till 30 mins later (I suspect it was a vapor lock) but i don't know why that would cause this idling issue. Any help would be much appreciated.