I have had this problem since I did oil cooler and changed my filters it first started as a miss when it got warm then when I changed my fuel filter it sometimes misses really bad right off the start or won't for a while drove for hr the other day ran great no miss or lack of power parker for few hrs got back in it ran ruff started to drive home and would hardly pull it's self after 5 to 10 min of driving it did this right when I started it after filter change and I did do the air bleed after filter change seam to help with ruff start if I prime it first need some in site please