check the E.H.A. systm it richens the fuel mixture in the cold to start engine,then leans it out once full operating temp have ben achieved. eha stands for electrohydraulic actuator.its a heavty price new approx $270.00-$290.00. i dont see how the ovp would limit the spark,but replacing an old ovp cant hurt,it does work wonders when installed id try the ovp before i shoot for the eha.

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