I agree with Ron that a vacuum gauge would be helpful here. It may tend to the side of far fetched to expect a 60 year old engine of unknown mechanical condition to idle glass smooth on pump gas. Time to give this engine a full physical, vacuum gauge, fuel pump pressure, timing light, detailed distributor/vacuum advance inspection and compression test. Its always better to determine problem via diagnostics than swapping parts.
-----Original Message-----
From: "'James Douglas' via Chrysler 300 Club International" <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Sent: Wednesday, February 22, 2023 12:05pm
To: "Chrysler 300 List Server (chrysler-300-club-international@xxxxxxxxxxxxxxxx)" <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: {Chrysler 300} I hope I did not buy an engine with a problem...
I pulled the NGK plugs with a #7 heat range. They have about 200 miles on them. The number 1 plug, I had it out and I cleaned it, before I drove back to SF it was worse than the clean plugs but not as bad as the darkest ones in the photos.
As the photos show, some plugs show fouling. The engine is not producing smoke on acceleration or deceleration.
I put in new plugs with a #5 heat range (hotter) and will see what I get. The idle feels a little better, but not dead smooth.
Issues on both sides if you look at the photos.
Next up is looking for vacuum leaks.
James
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