Fuel Regulator issue?

[SmoothRigoletto]

My Gf's 94 vtec sohc makes this really annoying loud rumble when i start it. Then the idle drops, revs up and then drops again over and over. It drives and all but it makes this noise like it's skipping and there's not enough fuel. Even when i drive it i step on the gas pedal and it hardly goes anywhere. I changed the spark plugs, spark plug wires, and the Idle Air Control, and still does it. What is this problem? There are no engine codes whatsoever. Could this be a fuel regulator issue? What is a fuel regulator issue, how do you know when it goes bad? Or could it be bad fuel injectors? It almost sounds like 1 cylinder isn't sparking or what not. If anyone knows how to solve this problem, please let me know. thanks.

 

[fijitec]

looks like the same problem my car has

 

[SmoothRigoletto]

i fixed it by now lol, yeah i know its been awhile but yeah, it was the idle air control valve. i had to take it out, open it up and clean the metal bypass where the two hoses connect. somehow rust or more like mud blocked the passageway and the coolant couldn't circulate. And the best thing is it doesn't cost anything but a little time. I'm thinkin about 30 mins in the making? Hope this helps.