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Decrease the timing? More likely you need to increase the initial to get the carb blades closed down. Is it pretty dirty out the tailpipes at idle?

What's your initial timing and total number. you may have to raise initial and limit the mechanical in the distributor to get the right total number.



Exactly, with increased timing the throttle blades can be closed some which will usually prevent dieseling with the same idle RPM. Yes a idle solenoid would work but with enough initial timing you can usually get by without one.