1970 Chevy C20 Pick-up, Making a "PPSSHHH" Sound when turning off..?

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10EM28

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2 WD, Inline 6, Turbo 350 Transmission...Sometimes when I drive for a bit, then turn it off, it makes a "ppshhh" sound...anyone know what it may be wrong with it?
I took my truck to a mechanic, & he did say it was Dieseling, and that the timing might be off... or something like that...im no mechanic ..LOL O_o...
 
Dieseling.

Check / replace all vacuum lines and cooling hoses. No, replace them ALL!

Check / replace plugs, points, cap, rotor, etc, and set timing.
 
Sounds like the radiator, or maybe a leaky hose or gasket. It's pretty old so you should probably get all the hoses checked out anyway-- they crack.
 
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