The intake plenum on most cars is bolted directly atop the intake manifold. This is where the air goes after passing through the throttle body.
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on the 305 EFI its located direct center underneath the intake plenum. have fun. its a nightmare.
Under the hood, they are plugged into the Intake plenum by the MAF.
Not sure what engine you are working on but if you are using a new gasket there is no need for silicone unless the directions included with the new gasket require it.
if you mean it doesnt crank long enough to start you probably need a battery. i suspect that the battery is dead because it takes so long to start. long crank times on these engines is usually caused by a bad cold start injector (found in the intake plenum on the passenger side, it has a small diameter steel fuel line and a 2 wire plug connected to it. held in place by 2 10mm screws) or the cold start injector time switch (found in the back of the engine behind the intake plenum, it sits in an aluminum casting that holds other water temp sensors and has a blue plug with 2 wires on it). replace these 2 items and you should be fine as far as hard starting goes.
underneth the intake underneth the intake