Antifreeze by spark plugs, car skipping and feels like turning off, check engine on 1995 Ford Thunderbird

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Only on the left side(driver side) spark plugs (not) inside of the engine, there seems to be antifreeze on all plugs, the check engine just turned on. The car after a certain speed starts skipping and at stop lights feels like is going to turn off. I will need to replace the wires and spark plugs, but how can i fix the antifreeze from going in there and what causes this.
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