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Cylinder 4. Each cylinder has it's own coil above the sparkplug. If you have a misfire, it's probably a bad coil. But if it's an intermittent misfire, it may be the wiring to the coil. If it's intermittent, start the car and wiggle the wires to that coil. If you cause a misfire you need to check the wiring to the coil. Goode luck.
Usually the coil pack is directly on top of the engines intake. Later model SOHC engines had the coil pack on the back of the intake on the passengers side of the throttle body. All DOHC models have coil over plug systems and the coil is mounted on the valve cover and connects directly to the spark plug and is held in with a 12mm bolt and a black or white connector depending on the location of the coil. I hope this info helps.
Causes of ice build up on coils:
Not enough freon (leak).
Coil defrost heater not working (Coils on all freezers freeze up, but you should not notice).
Coil defrost timer not working.
Compressor thermostat not working (or end fell out of proper location).