Demonspawn29

Hello I am new to this message board and am having the same issue. I have the same starts fine but within 30 seconds of running it runs rough. If I try to back out of the drive way it will do so but as soon as it is put under a load it hesitates. I pulled the plugs and they were not the correct plugs for my 05 GMC Yukon. I did replace them with the recommended AC Delco plugs for my vehicle. Problem is still there I then after reading your post replaced the 02 sensor one bank one before the cat. After doing so it runs better but still not to the level I would've expected. I am wondering if I should then replace the sensor on bank 2 before the cat as I would assume that if one is bad the other is probably as well. Thanks for your reply in advance