My 89 honda civic has been running rough

well it is misfiring so get the car to a shop and get it serviced
like 99.9999% do today (a real show with real tools) seems not.
you have no tools to fix the car and no scan tool
nobody can fix cars lacking the OBD2 scan tool (real)
there are lots of causes. but in school day 1 they say
:bad engine (say compression is 200,.201,202, and 50.PSI (i can do BAR but so can you google PSI to BAR)or KPa.

or bad spark. (bad cops, ?) bad COP boots.
and last bad fueling, misfire felt here is way too rich burn.
in that order.
guessing will be costly and already has.
what if the scan told told you P03xx errors
and was 301. and spark hole #1 , is 50PSI. oops bad engine
or P03xx code for CMP ,and the cam sensor is bad. or cam belt slipped.
what if the P0301 ( my 1 guess) is bad COP, cylinder 1.
there is P03xx code for bad CKP too and P0300 coded means all 4 plugs show misfire. (cam slip or cmp/ckp fails)

1.5T is DOHC engine.

learn to scan he PCM, or go broke fast
the PCM will always see misfire and have DTC P03xx codes
to tell you what's UP, no looking is HUGE FAIL./
code p03 is spark section failure.

RHD car not USA so is UK or one of their infamous Crown colonies
not told. you.
our 1.5L is 2 cams and chain drive, no stinky belt drive good
and low miles is good.
the engine may be VVT got that? if yes it can fail and cause misfire easy and again the scan tool will show that signs of it to a pro.
vvt is called VTC by honda and is complex (more)
VTC is variable valve timing, and the part on the front of the cam can fail for that.
find a real shop this time that knows honda's and VTC and can hold a scan tool.

Torque Chart - E3 Spark Plugs

e3sparkplugs.com/torque-chart/

The table below lists the torquing specifications for most spark plugs being installed in either cast iron or aluminum cylinder heads. Torque values assume clean, dry threads.

Tech Specs - Spark Plug Cross Reference, Torque ... - Autolite

the code po301 is a misfire . just change your spark plugs,and the code po1399 is yourdown stream o2 sensor. you need a new o2 sensor

I don't think it is your catalytic converter because your light usually flashes and a bad cat I never heard of them causing a misfire. I ran your other code it is for a faulty EGR system. Exhaust gas recirculation excessive. You are getting too much exhaust gas back in the system. This will cause your misfire. Go-to a trusted mechanic and have them check out your EGR system.

that is a muffler shop where they get paid commissions based on parts sold. go to a real mechanic, he should be able to quickly identify whether you have a fuel supply OR spark problem so as to minimize replacing good parts and head scratching! fuel pressure can be tested, so can fuel pumps.

As long is it isn't the vetec engine, if you are looking for part numbers the NGK number is 2477. The Bosch number is 4501, That's the ones I would use. Autolite makes a pretty good platnium plug part number AP5224. not sure if that's the info you wanted so I hope it helped anyway.

check the throttle body
spark... check
fuel... check
air...

Bear in mind that the guys at autozone were delivering news papers two weeks ago and the generic analyzer they use costs less than $45.00. It is a 2004 Honda, you can spend a buck on it. Take it to a real shop with real mechanics and have them put a real analyzer on it.

bro, check ur main relay. its under the dash. replace it, check also ur distributor(replace it). and also your ECU

Well some spark plugs are better than others for certain cars and Autolite plugs are not recommended for hondas. As far as oil showing on the plugs the more likely indication is that the valve guides have gone bad on the engine. A good sign of bad valve guides is if the car smokes more when you first start it after it has been sitting overnight. The Proper way to test for a sound engine is to do a compression test on the cylinders, that way you have a percise check on the overall health of the engine(for a mechanic to say otherwise is not a good sigh). If the car does have bad valve guides it is not threatening to the healh of the engine. You biggest problem from faulty guides is that it will cause you spark plugs to foul(oil soaked) and not fire as well as it should, In my opinion and without having the results of a compression test I think that valve guides is you proplem and not a "bad engine". The reason for your car smoking more after the new plugs is that they are able to burn the oil and you older autolites could not. My biggest and most important recommendation is that you never go back to that mechanic again.