do you use name brand fuel, or any place? google top tier fuel. and precious metals tipped plugs come pre gapped from the factory, you do NOT regap them. do NOT confuse this with the PZFR5F-11, which is the same plug, but with 1.1mm gap, way to big for 2.3. and you DID put in the ngk 3741, right? this is a PZFR5F(.7-.8mm gap). I think 0300 is when you get more than 1 miss. no codes were thrown to tell me which cyl, too. at least it was on the left bank, which only takes about 30 min to get to. so i had to then change one coil, test drive, after the second one, miss was gone. yup, now the white car did the same, black car ran good. i took the 3 left bank coils from the white car, and swapped them. run fine cold, but when hot, and under load, i would get a slight miss. i had an intermittent coil on the black car. if you want to be safe, get 3 known good coils to install in the right bank, then you wont have to go back on that side. if you have never change spark plugs, now would be a good time to do so, and then swap the coils right to left bank, clean out the wells, too. shop will just charge you for them and not change them. if you have never changed the spark plugs, or have paid a shop to change them, a lot of the time the right bank dont get changed because of the intense labor to get to them. also, you probably have a lot of oil in the spark plug wells, and again, when hot, will contribute to missfire. when the coils heat up, they can become unstable. and, of course, those cyls(1-3-5) are the most difficult to get to. i also had an injector crap out on that side, which also is where the abv solenoids live. this side gets a lot more heat, and the coils and plugs seem to go bad the most there. I would check your coils on the right bank.
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