[HighPlainsDrifter]

Steve,
A tip on this trouble;
Sometimes a simple plug gap can fix this stumble, reduce the spark plug gap to .035 , our crappy gas is to blame for the most part.( not fair we pay more for this watered down junk.) In 1970 premium was 102 octane and reg was 95 octane, our cars wouldn't run on 95 then and still won't now on poor 91 premium.
Perry.
ps- the douple pump will lose 5 mpg.