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I see. When you fire it up and it's reading 30psi one day, pull the vac hose off and check if the base setting is still at 43.5. Should tell you if it's pump/FPR or a vac issue. I think it will change slightly with the weather.. When your fuel pressure is out of whack what does your boost/vac gauge show? gl with the tuning, I'd reset the FPR when you get there and check the pressure between runs if you can.
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