I had the same stalling at a stop problem. Definately clean the IAC.
The isolator bolts aren't an issue on the '98 but the fix is still a good one for cleaning out your EGR ports. Clean the upper and lower intake manifold very well, too. I used Seafoam and carb cleaner... and a hose. It was filthy.
Chances are you might have a clogged vacuum line too. Get a vacuum tester and a diagram (I thing the Haynes manual has one) and check the vacuum at the upper intake manifold on the back, the manual should give you a range. If that's good check the vacuum at the end of each vacuum tube from there, especially the Fuel Pressure Regulator, Exhaust Gas Recirculation Valve, IRMCs, Break Booster and the Vacuum Reservior. If you have a clogged line, you can get replacement tubing and connectors at the parts store.
Check your PCV valve too.
Good luck.