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So I own a 1999 Buick Regal GS and I recently I replaced my cylinder heads because my previous ones cracked in multiple places because i was running lean for so long with no knowledge (was dropping fuel pressure) now I replaced the fuel pump with a zzp350 in tank fuel pump and also went e85 with a smaller pulley and come to find out that I’m still dropping fuel pressure (replaced fuel regulator, replaced the fuel filter, replaced all injectors for e85) any ideas on why I’m still dropping fuel pressure?
 
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