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My problem
I am trying to find out why my plugs foul in less than 8 hrs of running. Identical Black sooty fouling on all 4 cyl .
Vacuum at idle is 18-20, and goes to zero at 3/4 throttle. Cyl compression is 90, 95 , 95, 90. Exhaust is blue-gray on start, clean at 165 degrees, timing is at tdoc. I run the slightly hotter plugs and engine starts incredibly well.
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