How I fixed rough idle & misfire code P0302 + Where is PCM ECM ECU Computer on 2014 Chrysler T&C?

*Update. Plugs, coils, fuel injectors, and Gas additives did not fix the Rough Idle, or the engine light on with code saying I had a #2 cylinder misfire. So I elected to do 1 more thing to see if I could fix it before heading to the dealer to spend way more than a person should.  The ECU computer I figured, was being affected by heat, so I exchanged it for a refurbished, re flashed one from Flagship One.  It instantly fixed my rough idle and the engine light has stayed out.  This may not work for you, but it worked for me, so am happy about it, as this car is paid for and works well for carrying my aircraft and pulling my boat.   After this change for me, I occasionally still get the misfire code, but I reset it and it goes for months at a time without a misfire.  So not 100%, but better.  I also found a new battery and cable ends helped as it needs to have good battery at idle to provide spark.  If your headlights flicker at idle, you may also need a new alternator or regulator to help keep the voltage up enough to make a spark.  Good luck with it. Thanks for watching and stay safe!
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