Asyetuntitled

Hi guys, new here and wondering if anyone has had this issue, I've got a 2004 2wd hilux with the 2.7 3rz engine, it previously was missfireing and not revving over 3000rpm with a loss of power under load, the problem got worse over 2 days and broke down and I replaced the fuel filter and fuel pump, fixing the problem for about a day until it started having the same symptoms as before and now randomly looses all power while driving under any engine load conditions and starts cutting in and out until I loose speed and it stalls... Has anyone ever had this problem? If so what did you do?