TDLR: 2007 Altima 3.5, Ran the Engine without Coolant (cracked Radiator) Car went into Limp mode. Limped it home a few miles. Replaced Radiator, Gutted Clogged Cats, Cyl 5 Misfiring constantly, kinda stops misfiring at +3k RPM. MPG went from 27 to 15. Engine Damage or Fouled Plugs/Coil?
So I...