I have 5.0Ho motor, 25k i since installed my self. Does not run exactly right.Want to change to SFI with mass air flow .Engine re-man from Ford. Installed roller rockers in addition to the roller lifters from Ford. ford M/S headers,3" exhaust.K& n cold air intake. A 1"twisted Throttle body spacer .Flex-a-lite 295 electric fans.All sensors are new. No codes from computer.@ 35 miles per hour it acts like it misses, sometimes it dies after cold start and put in gear.Also has neww throttle body.W/o Throttle hauls But.