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try this idle engine in drive with emergency brake on.grab 12mm wrench and open the fuel lines at the fuel distrib one at a time to see which one makes the least difference to the running.it helps to have a vacuum gauge under the hood when doing this.what i suspect is that your fuel distr is not providing enough fuel at idle on one cylinder.my 420 with exact same setup only 8cyl is doing the same thing.i can mask it almost completely by running the a/c at idle and loading the motor.
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