Hell all Jeep 4.0's from 91-99 have the manifold problem whether it's a Cherokee or TJ. I wouldn't let that deter you if the deal is good enough. If you have to have it replaced then probably 100 for the part and then 400 for the install at a shop if you can't do it yourself.
President - Arizona Off-Highway Vehicle Coalition
Vice-President - ASA4WDC
Arizona Rock Rats