I can help you with picking valve springs, just need to know the IH of the springs. I don’t think you’re issue is with the valve springs though. It still sounds like your fuel pump won’t build pressure. It takes flow to build pressure, it doesn’t sound like it has enough flow at idle to build 60 psi. Probably gets worse as it tries to add fuel.
Last edited by Jay S; 04-06-2024 at 08:28 AM.
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