Ok guys, I have been looking around the forum but I can't seem to find anyone else with this problem so I will just open a new thread. Ok I own a 97 mustang v6 with a CAI only. A week or two ago I noticed that the car started to hesitate or bogs down while it was cold even if I waited a minute or two for it to warm up. Once the car warmed up and I mean when it gets to normal temp range it would stop shaking and hesitating so much. It still seems to hesitate while its running at a constant speed and more in slower speeds then higher but not nearly as bad as it does while its cold. My brother works for a public utility board at the mechanic section and he brought home the computer they use at work to test the car and the results would come out as oxygen sensors bad and misfires on 1 and 4 pistons. So he told me it could be the coil pack. I went ahead and bought MSD street fire coil pack with MSD 8.5mm super conductors with NGK iridium sparkplugs to go along with the coil pack. (I thought since I'm there might as well upgrade a little
) So after all was said and done I went to turn on the car and drive it and it seemed like it got fixed so I left it as is. (This upgrade was done today in the morning by the way) As I was coming home from work about an hour ago it started to do the same exact thing. I should also mention that it seems like there is loss in power on take off hot or cold even on the acceleration. I was thinking that it might be either the fuel pump relay or the IAC but I am just spit balling here. Any suggestions are more the welcome and fast suggestions even more so. Thanks in advance. Sorry about the book I wrote.