Spark plugs are carbon fouled and using a lot of gas
Here is a good read on plugs...http://www.ngk.com.au/spark-plugs/technical-information/spark-plug-analysis
What's your question
go up 1 or 2 heat ranges on your spark plugs.........!
No Kelly, fix the problem don't monkey with the heat ranges. Is there a check engine light on? Miles on the car?
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