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Matt and Mark, I think the problem that I have is when I start up I have to back out of my garage go down sort of an alley with 2 stop signs, then a few right turns, with stop signs. If I could just drive off at 3,000 RPM the plugs would stay nice and clean. I'm running MSD and #7 NGK's. If I warm up the car, pull a plug, clean it, it will stay clean all day. After warm up I removed the top cover( the one with 2 screws and can see that the thermostat is fully opened. I'll play with the metal disc's to see if that helps.
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