Lloyd E. Sponenburgh wrote:
Randy fired this volley in
:

exhaust check put on a vacuum gauge, run at 3000 RPM vacuum should
hold steady, if it drops off look for blockage.

So, you're saying, if the EXHAUST gasses show a lower vacuum at speed
than the vacuum they create at idle, there's a problem?

Well! I'd say so!

Lloyd

I took it to mean intake manifold vacuum . If the exhaust can't get out ,
the new air charge can't get in ...

--
Snag