fluctuating fuel pressure at idle

NicksGTR

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Apr 27, 2007
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Just installed Vortech V3 on my 01 Bullitt. Used Walbro 255 for fuel pump upgrade. I installed fuel gauge on fuel rail and it shows a fluctuating idle pressure. Is this normal for a 4.6L 2V? Upon raising rpm's above idle needle is steady.
 

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