started bout a month ago, sometimes not ALL the time, when im going up a decently steep incline and im in a higher gear and my engien bogs, like 2000 rpm-2800rpm, the car jerks, as if the filter was clogged, so ir eplaced that 2 weeks ago, and it still does it soemtiems, i also have replaced the Fuel injector relay recently as well, i hope its not a fuel pump, or maybe its something to do with my throttle cable?? i dont know, im kinda stumped on this one.

any help is appreciated, thanks in advance.