There are way tooo many variables to that question anymore...ts not like its 1973 and a tuneup was points plus condenser air filter fuel filter...
If they replace plugs, wires, coil packs (all of them)....get your BIG checkbook out....
Easiet thing to do would be call around and get an estimate...me I have a mechanic that does my work, I trust him and tell him to do what it needs...unless I am on the road, but then thats would be a breakdown...the only maintainance i do on the road is maybe an oil change...speaking of, thats getting close, another 4000 miles...and Wal-mart does those for just the labor when i have them use my oil and filter....