Hello Board,

For about a week now, I noticed my car idling bad and hesitating when I pressd the gas. Well, today I bought a set of Bosch Super H9DCO sparkplugs to replace my H9DC plugs. Well when I took them out they all had oil on the threads, but my #1, #2 and #6 plugs had a very thick crust on the electrode. What could be causing that thick crust build-up on the spark plugs? My old spark plugs were about 3 months old and have about 1000 miles on them.

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1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
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