cylinder misfire again
lright heres the story...2006 2.4L started running stupid (sputtering, gargling, backfiring, especially in low RPM ranges), check engine light came on, cylinder misfire. similar thing happened about 5 years ago that was solved by new plug wires. thought maybe they somehow went bad after 60k miles so i bought a new set. this mostly fixed the problem for about a weekish (when i say mostly, i mean normal driving habits were back to normal, but if i tried, say, starting from second, or putting it in 4th while going 20 mph, the sputtering would return). but after about 10-15 days it returned to running crappy all the time. i thought maybe its the plugs themselves, but due to another issue i did not immediately change them (i had a feeling the last plug change resulted in some stripped threads and i wanted to try that last just in case i needed to drop in a helicoil). so i bought a new coil pack...maybe a slight improvement but still nothing fixed...finally convinced it was the plugs, i swapped them out (no stripped threads, whew!). but the same thing happened again... mostly fixed the problem for 1-2 weeks, but now its back to running stupid again.
i'm sort of a newbie here so i'm not sure what else to try. any help would be appreciated.