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Yes they do fit...yes they do improve rough idle...yes they do smooth acceleration. Time will tell on mileage. Good work whoever initially discovered this trick, and to all who have relayed it to me
lol...I drove around behind the autoparts store looking for wifi so I could confirm the number on my laptop. Of course I came to DodgeForum.com for quick answers.
They are...the plugs are identical, just a small difference in temp rating. Everyone was having such good luck with the 3923s that I just decided to do those.