I own a 1998 Jeep Grand Cherokee Laredo with 5.2l V8, I burn regular (octane rating 88) in it. Problems with stalling could be linked to poor fuel, try adding fuel stabilizer and topping up with fresh gasoline. Other problems may include an old fuel filter or clogged injectors. A good service would do lots of good. My Jeep seems to perk up with new plugs, oil and so on.