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On the 4.6 plug hole 4 passenger side near firewall, the plenum tends to crack at the heater hose connection. This allows coolant to seep down into the plug hole this left unrepaired will cause the car to idle rough and then bog down at lower speeds this will even out around 35 to 45 mph. Unfortunately the only fix is to replace to plenum. Oem

Ford around 500$ aftermarket 275 - 325 not recommended.

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Q: Why is antifreeze in the spark plug hole of a 4.6l ford?
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