The IAC will crap out, that's probably the idle problem. If it's a V8, they have been known to suck intake pan gaskets, making them gobble oil and run crappy. Check carefully for vacuum leaks, too.
If it has Q-trac it's a gas hog, it'll be twice as bad if it's a QT/V8. 4.0 6 banger and P/T 4x4 or 2wd, it'll last but it's unspohisticated, to say the least. Q-trac is pricey to fix, too.
Trim stuff is crap, the 'trip computer' (if it has one) is not known for long life. it won't affect anything, it'll just flash weird messages like 'brake light out' when they are fine.
A/C evaporators are known to leak.
The worst thing I have seen: they do not have a voltage regulator for the alternator, that task is handled by the PCM. It can and will take a dump meaning the car runs fine etc but it won't charge. No MIL when this happens.
There were recalls on some of the 6 cylinder cars for a condition where the catalytic converter would go bad but the MIL would not illuminate. The fix: reflash the computer to see if the CC is OK, if so return to the customer. The CC has a 12/12 warranty from the date of the recall repair. If the CC is bad at the time of the reflash, replace the CC at no charge to the owner.
There was also a recall on some vehicles for the transmission interlock, you could take the car out of gear with the ignition turned off.