Code 154

[Luther White]

Ok I pulled code 154 from A-2 EGR system leakage. I have all new vac lines, PCV system, complete tune-up. Is there a way to test the EGR valve to see if it is bad. I'm wodering if there is other things that can cause it to read leak in the EGR system. I know the manual says to.

EGR VALVE
1) Ensure all connections are tight and does not leak, vacuum
hoses connected and not kinked. Check EGR function with cold and hot
engine at different engine RPM.
2) With coolant temperature at less than 131 �� F (55 �� C), EGR
valve should be closed at all engine speeds. If EGR valve is open,
replace thermostatic vacuum switch.
3) With coolant temperature at greater than 140 �� F (60 �� C), EGR
valve should only open at partial throttle. If EGR valve remains
closed, check thermostatic vacuum switch by disconnecting vacuum hose
from EGR valve and blowing air into it. Air should flow freely through
thermostatic vacuum switch, if not replace thermostatic vacuum switch.
4) If EGR valve still will not

Question 1 How does one test the actual valve?
and
Question 2 What is the themostatic Vacuum valve...is that the Evap Valve, if so it is brand new.

Thanks