tune up

i have a 2003 impala. 136,000 miles. i know its bout time for a tune up. i was wondering how much would it cost me to get the sparks plug and wires changed and how long would it take for them to do it... just a average price cause every i know everyone charge different...

It's really difficult to give a price as they can vary widely because of location . I would suggest calling several local shops and simply ask ! When you choose which shop to do the work , tell them to do only the work authorized by you . If any additional work is needed , have them call you for authorization before doing it . Good luck !