Think I found it here
Quote:
Quote:
Originally posted by pesuazo
Go back to copper bosch copper sparkplugs. And take it from there.
The issue is not "copper versus platinum", but resistor versus non-resistor. About the only reasonably available OE type non-resistor plugs are Bosch Supers, which are available in both resistor and non-resistor versions. Make sure you get the non-resistor version specified in the owner's manual, which should be H9DC. Don't buy HR9DC. The "R" indicates a resistor type plug, and almost all other comparable plugs, including popular "platinum" replacements such Bosch Platinums, are resistor type.
Resistor type plugs may cause increased idle roughness and emissions, but the evidence is mostly anecdotal.
Duke
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Looks like I have to heat her again up and go get replacements.
P.S. Nothing like a good conversation with yourself.