Need more power
I'm not looking for it run like a sport's car, but I would like to drive a little more power. I just bought it, a '92 YJ w/ 163,000 miles 4.0, I6, automatic. It rides on 31 x10.5. I'm by no means a mechanic, but pick up things pretty good. PO, I don't really know what all he did. He probably just put bigger tires on. I know that having the bigger than stock tires will decrease power. I do believe all else is stock parts. No upgrades, other than the air filter. It's I believe, says JL, and looks like a cone air filter. So here's my question, What can I do to get more power? Money is somewhat tight, but I love the Jeep and want it right. So within reason, what can I do to add more power.