When my car is fully warmed up, and I shut it off, 2 seconds later I hear a short "phhhssshp" sound from the engine compartment (regardless of heater/AC on or off). Should I be concerned?

 

is it like liquid dropping on metal? tick tick tick tick tick tick tick tick? if its the tick, its the muffler

 

It's the throttle positioning and resetting itself. No worries. They all do it and are supposed to.

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<font color=red>GSM</font color=red>
<font color=black>Silverstone Coupe</font color=black>