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In front of the Plenum cover connected to the throttle body
If it is a tuned port injected motor, it is under the plenum. The plenum is the big grey aluminum box with 8 funny looking pipes, called runners, connected to it.
It is bolted to the back of the aluminum intake that is connected to the block. Its location is behind the plenum.
Any vacuum line connected to the plenum.
Starter is located underneath plenum.
Note: Cyls Compresion is perfect, sparks, spark plugs, ignition coil, all is fine You have an ignition coil at rear of plenum. trace wires back to it...it is bad! Replace it and you should be fine!
The plenum is the intake manifold.
The fuel pressure regulator is located under the plastic upper intake plenum and connected to the CFI assembly. This regulator is internal because it draws it's vacuum from inside the plenum instead of using an external unit with a vacuum line.
here are a few things that can cause this, bad ignition wires, or sparkplugs, dirty air filter,ignition coils faulty,fuel filter clogged,egr system, vacuum leak at plenum or intake manifold.
Plenum Press. has written: 'Marine science'
Plenum is another name for the upper intake manifold.
it is directly below the intake manifold on the engine block. i do believe it is the only 1/2 inch hose connected to the intake plenum.