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The general answer to your general question is;
All places that contain vacuum or are exposed in some way to vacuum or where vacuum is present.
Places like vacuum hoses, manifold gaskets, sealing O rings on the injectors and injector holders, aux air lines, brake boosters, transmission modulator valves, intake manifold seals, any plumbing connected to the intake manifold, vacuum operated devices such as climate control actuators, and the list goes on. Think of it as a game of hide and seek.
Look at all the components and ask yourself the question "Is there vacuum associated with this thing?" if the answer is yes - start checking for leaks.
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I got too many cars!! Insurance eats me alive. Dave
78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
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