ACURA MISFIRE PROBLEMS

I HAVE A 2000 Acura Integra 4 door Non VTEC DOHC Engine, with a misfire problem. It comes up with P1399, PO300, PO301, P0302, PO303, P0304 DTCS. I have replaced the plugs, wires cap , rotor button, and fuel filter and still having the same codes come up. SOMeone said the only thing that is left that could be wrong with it is the distributor( Which I really want to avoid replacing without some other professional advice because of cost) If anyones knows anyhting else that could be possibly wrong with let me know. I need all the help I can get . I am currently going to school to be an automotive service tech and this thing has stumped me. Anyways HELP!! lol

Timing Belt?

compression is good? egr working properly? correct fuel pressure and flow? distributor and or timing belt! If the coil or igniter as they might call it is part of the distributor then it could be it unless it's using an external ign module of some kind!

they said all of that stuff is intergrated into the distibutor the coil, knock sensor , and some other stuff anyone else have any more solutions

Oh I also notice we were reading the data from the sensor (voltage date) that the voltage on the TPS sensor was fluxuating isn't it supposed to stay steady if no one is touching the accelerator? I have that is not a cause to the problem because it is integrated into the throttle body and that is about $671!!! I am having second thoughts about having bought this car please HELP!!!

you're looking at it with a scope or just a digital multi meter? how much fluctuation?

i looked at it with a snap-on scan tool

but not scope? how much fluctuation in volts at idle? is going like .5 to over 1?