does my car need a tune up?

I have a 2005 Chevy TrailBlazer. It has about 60,000 miles on it. It has cut off on me twice in the last month. Sometimes it acts as if it wants to turn off but it doesnt.

I do not have a owners manual as the car dealership did not give me one when i bought it.

Any advice would be helpful. How do u really know when u need a tune up?
 
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