P0316 2003 Ford F150 -

Question

Misfire detected on startup

Answer 1

P0316 Misfire detected at start up

Any misfire condition present would need to be resolved, these could come from igntion coil, igntion coil boot that allow secondary igntion to seek ground.

 Igntion coil and igntion coil boots are mostly the cause of misfire conditon that occurs, Here a sparkplug boot allowed secondary igntion to leak and seek ground,