1997 honda civc 4 trouble codes po301,po302'po303'po304

all misfires and bad mixture of fuel and air

https://www.google.com/search?q=05+TAURUS+CODE+SHOWING+po171+po174+po300+pO303+pO304

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Do tune up,coils module,wires,plugs and see what happened..

Get your ECM replaced. Usually it's next to battery or inside front fenders. The rain must have shorted out connections and fried ECM. Engine will sputter until it is done. Usually autozone, advance auto, or dealer has ECM.

Well code 352 is for a problem with the primary circuit for the coil which could be several things other than the coil itself. You would need a shop manual to get the testing procedures. There's no distributor, so it could involve the cam or crank sensor, the engine computer, or the wiring.
Code 303 is for now power on cylinder 3 and 304 is no power on cylinder 4. In this case probably no spark.

I think that PO422 is the Cat Converter, it may be bad or may be just the O2 sensor.
The PO300, 302, 303, 304 code have to do with the ignition coils or wires. (302, 303, 304 means there are ignition /firing problems in cylinders 2, 3and 4). If your lucky just the wire and new spark plugs.
Google "engine codes Jetta" for more on web. Good luck.

I guess you have COP--coil-on-plugs

I doubt both #3 coils are bad

You need the PO303,PO304 & all the other
codes, I would also guess you have

This is a common problem but the cyl codes
don't always tell you what to do.

The proper coarse of action is to put an
oscilloscope on the primary or secondary
of the coils or use other scope accessories
to evaluate the problem.

Your driveway solution,which will work
is to buy 1 coil. Put it in #4,back cyl on
pass side and test drive about 25 miles.
A really hot day works best.
If nothing improves you move the new coil
to #3,putting the OE Coil back in it's #4
position. Use a sharpe on them to number
where they came out of.

You could have 2 bad coils but you have to
walk one at a time.

If you have 100,000 miles on the vehicle
you replace the front 2 O2 Sensors,Clean
throttle plate and MAF Sensor with the
CRC Products for that

You can not have any vacuum leaks anywhere

OBDII those codes generally mean misfire.

P0300 multiple missfire
P0301 missfire cyl 1
P0302 missifre cyl 2
ect.

Ensure you have the proper spark plugs. Check the coil boots/wires, look for burn marks. Anything beyond that you may have to take it back to the shop.
You are misfiring on all 4 cylinders and it is not spark plugs. Those misfires if not addressed can cause serious engine and/or cat converter damage. There are lots of things that could be causing it and most of them need to be checked out at a shop - unless you want to invest several thousand dollars in the appropriate equipment and training.

ck if you have spark at the coil for that cylinder. check the plug wire closely. if it has spark at the coil, then replace all the spark plug wires.

might be the coil pack is bad, wires, plugs, o2 sensors, dirty injectors, catalic converter ( only if you smell rotten eggs ) . cylinders are misfireing.

Check for a vaccum leak at the intake. Frankster016