David, I'm not sure what 4 pin module you mean. I will get new plugs but these survived the heat of last summer here in TX and never had any trouble like this. The color looks good on the plugs as well. I did have to regap them a while back. The were installed at .045 and checked them a few months later and all were at .055 or greater. Can plugs cause something like this ?
ER
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