spark plugs,senors,wires,filters,gaskets,fluids. These are things that wear over time on any car. Its doesn't mean your car is crap. If your not able/willing to diagnose the problem talk to someone who can. I'm assuming this is your first car? Go to auto zone and check the codes(ITS FREE). then go from there but my guess would be spark plug wires, O2 sensors. If you haven't done this already i would plan in the near future, changing your spark plugs, wires, coolant flush, air filter. These are the sort of things you should be doing as you near the 100,000 mark And please tell me your doing your scheduled oil changes!