Re the misfire, it might be worth looking closely at the wiring in the area underneath the throttle body and multi connector. It can chafe leaving bare wires exposed and the wiring for the coil packs is among the wires in that area and can be affected. Re the cold running problem, if it has a standard stat as opposed to a PRT it might be worth checking it to see if it has been drilled. The stat which came with my Rover 25 had two holes drilled in it both of which were about the diameter of a six-inch nail. It rendered the stat useless and it may as well have not been fitted at all. It caused running problems and overfuelling, the engine never got up to temp and the heater did not work as a result making the car cold and dangerous to drive in the colder months. Might be worth testing the stat if it shows no sign of having been tampered with.
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