The 3923s need swapping out about every 12K-15K for best results.
Jim Miller WB5OXQ wrote:
> I have had the 3923 plugs in my 99 R/T for about 30k miles now. I am just
> beginning to notice a very slight roughness at idle and I wonder if they
> could need replacement or cleaning and regapping. I also wonder about
> injector cleaning via the fuel rail, would that help or maybe the wires and
> cap need replacement. 49k miles on the truck. I also learned you cannot
> change the fuel filter since it is an integral part of the in-tank fuel
> pump. That was a surprise! I notice no loss of power or fuel mileage, just
> that very slight roughness at idle that was not there untill the last 2 or 3
> months.
> Jim in Waco.
>
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