[rhodog77]

99,

Here is the link

http://67-72chevytrucks.com/vboard/s...d.php?t=474683

I had a vac leak as well. i figured it out. it was the carb gasket. One way to find the leak is spray some starter fluid or carb cleaner around where you think the problem is....around the base of the carb or near any of you vac lines. if the motor revs up a bit....that is were your leak is. not sure if that is the best method but It worked for me..