I have a 98 Cherokee XJ with no performance mods done to it and I'm looking to build it into something with more power but I don't know where to start or what part to buy i was thinking about starting by installing a cold air intake but I feel like there is something else i can buy that will give it more power so what do you think I should start with. oh and its a 4.0L. I'm just looking to give it more power.

 

A healthy 4.0 is pretty well off in the power department.
I would adjust your TV cable if you haven't, then you could add a throttle body spacer or a bored out throttle body if you wanted.

 

X2 on the TB bore. 4 port nitro injectors are worth looking into as well. Maybe a stroker conversion down the road?

 

Even just changing out the stock exhaust downpipe will apparently give a good lift in power

I have bigger bore exhaust and header combos on my 3x '96 XJs and the stock one is noticeably less powerful

 

start with 4 hole injectors, new o2 sensors, adjust throttle cable linkage, and then new exhaust. Also clean throttle body, and IAC

 

save money on the rear O2 sensor, it does nothing except indicate failure of Cat..it does not cause any difference to PCM running engine

a new cheap one will fail, and factory ones are expensive