I bought these with a set of ignition coils: https://www.amazon.com/gp/product/B07DVTMN37/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1four Autolite Platinum Spark Plugs AP3923 :https:/ / www .amazon.com/Autolite-AP3923-Platinum-Buj%C3%ADa/dp/B000C1ZLI8/ref=sr_1_3?dchild=1&keywords=autolite+3923&qid=1593533749&sr=8-3Kia Rio 2009 suddenly found itself on the way home working very poorly and gave misfire codes on cylinder 2 when I plugged in the code scanner. Replacement parts came in 1 day (I have Prime). Ordered on Saturday and they were at my house on Sunday in time to fix the car - wow I was happy. Actually I'm not sure what the problem was because I just installed the parts and they were fixed right away. It could be any of the three. I'd recommend if you're having the same issue, replace all three anyway. My car has about 69,000 miles on it so I think it had to do with the spark plugs at least. The heat from the engine and the elements severely affects the wiring, which is why the wiring harness needs to be replaced. Not sure when Kia will need coil packs, but it seemed like a good idea to move to 69K anyway. This is a very simple task that almost anyone can do. All you need is a 10mm socket, a 12 inch extension, a 5/8 spark plug socket and a 3/8 ratchet. You can go to YouTube and find videos on it. The hardest part for me was unplugging the cable connector after so many years and miles, but I played with it for a few minutes and it popped off immediately. Small tin can works like new. I'm not sure how long the $29 spool packs will last (that's $29 for all 4). The dealer will probably have them around $400. I found them at Advance Auto and they were about $60 each. All were made in communist China anyway, so maybe they'll last a long time. I hope this helps as it took me a while to figure everything out. I hope this review helps at least one person.
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