does any one know where the #4 cylinder is located ? on 2001 GMC Sierra 2500 HD

it wants to stall when i come to a stop. no check engine light came on but put a code reader on it and came up misfire in cylinder #4

It's the second one back on the right. GM engines are odd numbers on the left and even on the right. On a V-8 it's 1-3-5-7 on the left and 2-4-6-8 on the right.