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Kinda sounds like a vacuum leak or maybe a carb issue (internal blockage).

If you can't find an obvious leak, I had a problem with a factory street Hemi intake that had a pinhole in the floor under the rear carb going into the exhaust crossover.
Took forever to find that.
Had it welded up and it idled fine after that.

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man, that one must have been a head scratcher! i have never heard of that, and probably would have never even thought to have checked that.

d

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It was definitely a head scratcher.

It was back about 1990.
The only reason I looked there was I talked to a guy that had run Hemi's all his life and he had seen it once before.
I took off the carbs and started looking over the inside of the intake. I saw one little black spot on the floor of the intake below the rear carb. I picked at it with an ice pick and pushed softly and it went right through.

Like I said before, had it welded up and it idled fine after that.