I have a 2003 dodge 1500 half ton, I just put a motor in and it ran great for about 20 miles and it started acting like it was missing fire and vibrating and when I let of the gas it dies
But will start right back up and it flashes the
check engine light and looses power but at
times gets it back. I have only drove it for
about 30 miles. I don't know what the
problem is?