so a family members 2001 Galant ES(2.0L 4cyl) cylinder #2 is misfiring pretty bad. i've replaced the spark plugs and both coils, i'm beginning to suspect it may be the fuel injector. so, with my head under the hood facing the car, which one is cylinder #2?

and when replacing the belts, what pulleys\tensioners should i also replace? the car has 130,000 miles. thanks