[kmarccoco]

well, i checked my manifold vacuum today. it bounced from 4" to about 12" of hg. the power valves were rated 4.5". with that in mind i believed that the power valve was staying open all the time causing the idle and whole circuit to be rich(open power valves = about 8 jet sizes). mabey thats why the smaller #73 jets seemed to make the car run really good(smaller jets and open power valve equaled itself out.). i also was turning the idle mixture screws almost all in.

so today, i put 2.5 power valves in front and rear and left the #73's in. now it has a hard time staying running with butterflys set properly at about .020. and when driving, it stumbles on med-hard acceleraton and has lost some power. also, the idle mixture screws don't do a whole bunch. i understand that the power valves = about 8 jet sizes when activated, so should i jet up 8 sizes to #81's????