spark plug metal turned a odd color ?

[matt]

i have a 1992 chevy 1500 4.3 v6 noticed the the number 4 cylinder the spark plug metal turned a brownish gray color it did twice when give it a tune up the rest are normal it does have a slight miss to it and i can smell gas very once in a wail what would cause this ?

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[college man]

could be oil, running rich,lean could you post a picture.see if this link helps.

http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp

[matt]

i should of mentioned this but here it knocks here and there. it blows blue smoke very time i start it. it has a sight miss. it shakes a little. seem it lack power a little bite. its firing on all cylinder tho and the would take a picture if i had a camra the number 4 cylinder spark plug doesn’t look like any it any it that link the metal on it supposed to to be sliver but number 4 cylinder turned the spark plug metal gray the rest of the cylinders are running normal like the should i never in it before with any of the engines

[Author]

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