[2SS6gen]

Just did a head and cam install and everything was great until the car ran for a while and started having pressure issues.It throwing codes for the hpfp system.The pressure idles around 60-70psi and sometimes it’ll jump up to 300+while reving and then after a few seconds it drops.The cam has a 32% + fuel lobe and I did install the cap for the hpfp.Any help would be greatly appreciated on helping me figure this out...