| first off, what i use in my 96 s-10 ls, 10w-30 wieght oil in the summer, calls for 5w-30, but..... you don't have to do the same as me, also a 5w-30 synthetic (mobil 1, or amsoil if you can find it) most others claiming full synthetic are group 3 hydro cracked and overpriced conventional oils.....and i wouldn't use em... 5w-30 synthetic would do greatly for it, conventional running at the temps you say, has broken down and isn't doing much to protect the engine......., as for the heating problem, whens the last time the radiator was flushed??? well if it hasn't been for quite a while, have it done, and also have them check the hoses, the radiator for cracks, leaks, etc, and the coolant level, dexcool, 2 bottles for a flush, and have them check the thermostat, the engine should run around 210, lower in cool weather, normal to go a little higher, but should drop back down, so it sounds like its not working, kinda cheap to replace as well..... afterwards if your looking for a little cooler operating temps (after its fixed) try some water wetter, pretty good stuff. and as for the rough idling, does it do it all the time? or after it overheats, if all the time i'd say the injectors are clogged and need some good injector cleaner, or if too bad replaced, if bad....... otherwise the plugs ( if they havn't been replaced in a while) sounds like its time for that as well, it deffinently isn't the battery causing the overheating. | 
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