Have a Holley 4175 spread bore with electric choke on a 440 motor. Changed the timing chain and the car starts right up and runs smooth for a minute or two (even with a load on) and then it starts to falter and the idle with a load on becomes rough. I'm suspecting the choke needs adjustment but I don't know which way (richer or leaner) and to what degree (one or two notches? ). Or maybe its not the choke at all. Any ideas on why it goes from smooth to rough idle in a minute or two? Paul...
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