Sometimes the PCV valve can cause the engine roughness, have you checked it?
also if you are going to remove the plugs I would install new ones, since
they are so inexpensive, this is peace of mind.
----- Original Message -----
From: Jim Miller WB5OXQ <wb5oxq@grandecom.net>
To: <dakota-truck@dakota-truck.net>
Sent: Tuesday, November 12, 2002 6:02 PM
Subject: DML: Spark plug replacement/cleaning question
>
> 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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