159835, that is a lot of miles for a 4 year old car are you sure is that the right amount? If that is the case, that car was driven the piss out of it !
Anyway, Tune Up is an old term and today's cars does not need that. The computer does the Tune Up for you more than 10 times a second. Now, what you need is maintenance. Changing plugs and wires is not a Tune Up, you are not Tunning anything. But is a buzz word for performing a higher maintenance beside changing oil.
When you take it for that, ask, what did they Tuned? I bet they will give you a check list with some items they checked, add some fluids and changed some. But no adjustments or tunning. Even if it placed on a Computer to check it, no tunning has been performed, just checking the sensors and error codes. And again, no tunning has been performed...
Take it to a really good shop for some Maintenance / Service.
Good luck hon ! :-)