I bought my 2013 5.0 a few months back and have noticed the start up takes a few extra seconds to crank most of the time. Recently I got a tune and catless x pipe. I noticed while merging on the highway my check engine light started flashing and the car lost a lot of power for a few seconds before the check engine light went off then could feel the power kicking back in. I read the codes and had multiple codes for misfire in different cylinders, air fuel ratio in bank 1 off, and misfire on...

2013 slow crank and misfire