Coolant is leaking into the cylinders, causing misfire. Per this document that you guys posted: ‘Customer Satisfaction Program 21N12’, this is a known manufacturing defect in the engines that are in the model of car that I am driving currently. This is a safety issue and an environmental issue. Coolant gets into the cylinders and burns, emitting into the atmosphere. But the coolant also runs low, and the engine could overheat or catch on fire. The mechanic is estimating currently that the repairs to either change the head gasket or take the engine apart and rebuild it will cost around 7-9k, money we don’t have. Ford should fix this manufacturing defect at not cost to us, as their CSP 21n12 document states. The only caveat is that the car has 98k miles on it while the cutoff for these repairs ends at 84k miles.