i have a 4th gen. with the h23 in it. i ceased the other h23 i had in the car swaped the motor and then that motor didnt run right cause of a valve not seeding properly..so i put the head from the old motor on and it runs fine onyl right as i start to accelerate i get a slight hickup im pretty sure its a missfire but it only has this problem with this head.....any ideas?

 

needs cleaning