Alright, I'll make this one very brief. On cylinder #4, the spark plug can be taken out without any idle change as opposed to the other cylinders. During regular driving, the car hesitates horribly until about 3-4000 rpms, then it goes away, that is in all gears. Any ideas? I was thinking some things here. I thought i could check the ecu codes for something or replace the whole head entirely. Thanks for your input.