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1978 280z Idle fluctuations and fuel pressure drops?


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As the title says, my 78z has been having some idle issues.  My Z has been running hit or miss recently.  Either it runs perfectly, or it runs with weird idle fluctuations and pressure drops.  The idle rpms rise and fall between 300 and the normal 800.  I suspect my fuel tank might have junk in it, and it might be clogging the fuel filter I have, hence the pressure drops.  See attached video.



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