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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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23,862 Posts
I would also recommend the correct replacement OEM parts. I have had aftermarket O2 sensors and spark plugs cause running problems on these. Use the Champion platinum plug listed on the underhood label or in the owners manual. The O2 sensor should be NTK/NGK or Mopar.
How does the #3 plug look? If it is carbon fouled or the gap has closed up, that can cause misfire. Intake manifold pop-back can be from a lean mixture. It takes a long time to set a P0420 cat code.
 
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