I take it you have the I6 engine? Use AC Delco 41-103's for the spark plugs, these engines love these plugs. Other brands MAY cause the engine not to idle nice and smooth. Clean your throttle body with throttle body cleaner, with the battery disconnected, needs to be nice and shiny. Change the 02 sensor upstream right next to the exhaust manifold, that's the easy one to change. Also, replace the fuel filter and air filter. And of course, change your oil, Mobil 1 synthetic is the best for these. Check all your fluids also, like differential, tranny, xfer case and so on. If you do change the fluid in your tranny, use GM's new Dextron 6, will shift better and make your transmission last longer.
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