Hey folks,

As the title says, I'm having issues with my car during cold start ups. The car usually misfires until it gets a bit warm, then drives normal after. While I'm cruising, I get P0089 sometimes which stands for "Fuel pressure regulator 1 performance" for some odd reason. Autotech Hpfp seems to be hitting +1900psi in WOT and idles at 415-450 psi but sometimes drops between 260-300 when I downshift, then goes back up to normal psi. The misfires occurred in Cyl #1 first but I've been getting multiple/random misfires in the past two weeks. I have all supporting mods installed and this issue started after I got dyno tuned. I contacted @Fobio regarding this issue and he said Its not related to the tune at all and these codes come and go sometimes. I would appreciate any help possible to figure it out. Thanks !