That implies there was a problem with the vacuum pipe or the vacuum capsule
on the distributor, i.e. a leak. In normal use there is no flow through the
vacuum pipe other than the tiny amount needed to deflect the diaphragm. If
there is a leak it will pull through air constantly and weaken the mixture.
Can't speak for a Weber but with SUs and Zenith (and I can't see the Weber
being any different) vacuum advance gives sharper part throttle acceleration
and improved cruising economy.
PaulH.
----- Original Message -----
>I had a similar sounding problem. It turned out that my vacuum advance was
> the source of the problem. The car would run great when accelerating and
> would
> miss at steady speed. I followed all of the things that you mentioned to
> no
> avail. I pulled the vacuum hose going to the the distributor, plugged it
> and
> the problem was solved.
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