Quote:
Originally Posted by babymog
Most common source is the fuel pressure regulator, forward end of the fuel rail. A hole in the diaphragm will allow fuel to be pumped down the vacuum line and into the intake causing a rough idle after running a few minutes.
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I've did the (unplug vacuum line at regulator test) multiple times while the engine is running. no liquids or smell. is that test sufficient or should i go ahead and change it?