Checked CEL...anyone know what might be teh problem?
 

Hey,
My car (99 civic si) just recently started to run really rough when I accelerate. I mean the entire engine would vibrate and teh cel light just came on, and this just happens after the car has warmed up, but runs fine before then. I checked the codes and its a 71, 72, 73, 74. Misfiring in ALL FOUR cyclinders. I rarely push this car at all, and I change the oil religiously at 5000km. Anyone know what the problem might be?

I plan on getting a b16a2 anyways, but i would liek to fix this problem cuz its just getting plain annoying when I accelerate.

check fuel pressure, distributor and ignition wires and MAP sensor. Im guessing its fuel pressure or the distributor or ignition wires. When was the last time a tune up was done? what was changed?

Last tuneup was done last year. The car only has 115000km on it. I remember the guy changing the spark plugs and distributor. I could try changing the spark plug cables since those havent been changed. Could it also be teh fuel filter?

fuel filter clog could cause the boggyness

also noticed on teh dry days it drives fine, but once it rains or if there's lots of moisture in teh air, then it begins to misfire. Does that give any clues to what it might be?

Check that you spark plug wires are in good shape.
A quick check: in a old spray bottle (windex or similar) fill with water.
Spray onto the plug wires and see if it runs rough or you may even see arcing from wires to the valve cover.
Also check that the distributor cap doesn't have any noticeable cracks on the outside and that the rubber gasket between the cap and distibutor housing is still there. Also spray some water on the cap as well and see how if it runs rough or not.

Cool i'll try that.

Hey, so I finally got a chance to check teh wires and distributor. Turns out it was the distributor. Thanks for the help guys.