[TR] TR4A Crankcase Breather Valve

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Hi List

I've been having troubles with my front SU carburetor idling to fast.  I've
made sure there are no leaks and there is nothing hanging, but the
carburetor reuses to go less then about 2000 RPM.  I then plugged the hose
from the intake manifold to the Crankcase Breather Valve and the RPM dropped
sharply.  I assume there is a lot of air getting through this system.
How do I check the whole system to see if the breather valve is functioning?
Can I get rid of it? 

Jeff Porter
67 TR4A