Surely it's a straight six? I've had a couple and had no problems other than a few minor electrical glitches and the odd oil leak but they were fairly new and lowish mileage. They are well known for rear axle problems, poor electrics, rusting on the roof, screen leaks, exhaust manifolds cracking and generally poorly screwed together. On the plus side, I really enjoyed mine, found them comfortable and quick and simple enough to look after.
If you get a cracked exhaust manifold, let me know as I have a repaired one going cheap and a spare fuel tank. Might even have a factory dog guard somewhere too.
i have a n reg cherokee drives realy well has don 105000 miles had to change rear dif oil because of keak but apart from that ok few small rust spots on roof but easy to sort out other than that solid car fun to drive electrics ok parts can be dear but plenty on ebay but mine does fsh from new.
message to nick i might be interested in dog guard at right price am also looking for bracket to place spare wheel on outside of car if anyone has one.