Slow and sputtering

Hey everyone, my skyline is runnig terrible. sometimes it runs fine then i will start it again and its like it has no power, delayed response and sounds like crap. and advice?:46:

when its running bad unplug one coilpack at a time if when you unplug one ci=oil pack and theirs no change that ones broken, almost sounds like your running with one cylinder cuting out.

what kinda fuel pump do you have?