I have a 4.0 01' TJ, and earlier today I was doing deliveries. I noticed a rough, rough start. It went away after hitting the gas to back up then drive forward. I think it's been 3,000 or so miles since the oil change. I am hoping that is the problem. What do you guys think? Also the check engine light was on because of bad o2 sensors. I didn't change them (lost of money) should I do that as well??