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Run autronic ECU. Idle almost like stock. But if you have stock ECU, it going to lope pretty bad.
My Kelford 272's idle just fine on the stock ECU. It just takes a little adjustment to idle timing, and some of the idle tables. They have some lope, but no issues.
I've got Kelford 272's on stock ECU. I'm only on my first ROM from Mellon, but it already idles very nice. A little bit of lope, but who doesn't enjoy that