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So we replaced Ranger 2.3L spark plugs a couple of months ago. Truck now runs very rough, customer says he "may" have gotten it hot, but only drove a block. Boss said pull the head, he suspected head gasket (coolant looked like mud). I got the head off and check out these two plugs:



These are brand new platinums. Could a little overheating melt them that much that fast or you think something else could be wrong?
 

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I melted a plug on my number 3 cylinder just from over heating my supercharger. What happened was the iat went bad in the manifold and the air temp was reading like 110 degrees at most. So it never pulled timing and it was predetonating. Idk if thats a possiblity for you but thats the only time I ever melted a plug.
 
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