the first clip is just flat out idling too low; that would drive me nuts, not a good sounding idle in my opinion. I had a friend in high school that had a tunnel ram on a stock 383 Road Runner, so he idled it like that guy to make it sound like it had a bigger camshaft in it.
As above, the camshaft affects the idle quality and speed. There is no reason to have to keep your foot on the gas to prevent the engine from stalling however, no matter the cam involved. That's just poor tuning or poor combo of parts.
Jody
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