Chill out a second...
First of all, the Autozone guy said "the #1 and #4 cylinders are backfiring and to change the spark plugs and wires"??? Bad plugs or wires won't go bad in pairs like that.
The Autozone guy is not supposed to diagnose your problem, only read the codes. Diagnosing codes is the job of a technician, or a forum junky. Did you note the codes? Did he write them down for you? If not, go back there and get another scan and write down the codes.
We need the codes to diagnose the problem, but I suspect the coil pack is bad. Cylinders 1 and 4 are on one circuit, and 2 and 3 are on the other. Probably the codes were P0301 and P0304.
Don't let the Autozone guy diagnose the problem anymore, just get the codes.