My car is experiencing a clunk while coming to a stop. The clunk is happening at approximately 15 mph very low rpm

I plan on buying a mityvac hand pump.

With the mityvac I will disconnect the line going to the transmission modulator and the apply 12" of vacuum. If the vacuum holds for 5 minutes or slowly leaks down over 5 minutes, my guess is the modulator is good?

I am also experiencing slow shutoffs(2-3 seconds after key is turn off).

I will check the shutoff valve also.

EGR is still connected. I plan to disconnect all vacuum lines going to the EGR and 2/3 valve and patch where they were tied to other vacuum lines.

Vacuum to doors is plugged at firewall(the yellow valve). Center vent actuator doesn't work and I assume it could be a culprit to vacuum leak?

Does my plan sound correct?

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