Oil looks ok, but oil in antifreeze. Car slows on incline. What causes this?

on 1997 Chevrolet Cavalier

What causes one plug to blacken

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2 answers 2 comments
Auto. trans.?
YOU DONT SEE THE CONNECTION DO YOU????
TO BAD!!!
Cavalier and Caravan..........
poss intake leak.what motor do you have?
2.2 manual transmission