Thanks for the info. Vacuum is strong throughout the system, it is not a
leak. It has something to do with the adding or venting of vacuum which was
changed when I replaced the 'piggyback valves' on top of the valve cover. the
old ones were almost completely worn down, and replacement of them now will
change the depth, etc that they get pushed in, and thus the operation of
That is what has caused the change, but I dont want to go adjusting stuff
before being sure what to adjust.