Engine misses at low rpm's not a dead miss on 2005 Ford F-150

After it shifts out and the rpm's drop around 1500 the truck starts to jerk.

Asked by for the 2005 Ford F-150
what motor do u have ?
5.4 triton
poss coil pak going out. do you have a ck eng light on?also under the coil pak there is an insulator that connect coil pak to spark plug that may also be cracked and causing stumble