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A: yes a car can run with faulty coil B: May or may not depends on the extent of the damage C: Highly unlikly, but possible there Computer (PCM) does get a TACH signal from coil, but i've never seen a coil take out a PCM in a focus before. Still possible i guess. D: Yes, i would change wires...

dont think it will be timing chain i'm pretty sure 300 i6 is a gear on gear mesh no chain. Could be cracked head, block or headgasket. I would start by doing a compression test. as for question 2 it all depends how much damage was done. You might be better off buying a used working motor and...