tune up
They (LS1's) are a little difficult to work on but not as bad as an LT1 (opti)
My best advice would be to search and read and try to do most of the work yourself.
A basic tune up would not be very hard:
Plugs (can be a pain,but still very much in reach of a beginner)
Plug wires (not really necessary unless the stockers are damaged)
Air filter
Fuel filter
Oil change w/filter
Change your coolant
Check/replace hoses/belts as needed.
This link along with good ol' LS1tech should be all you need to get started.
http://www.installuniversity.com/ins..._documents.htm
Also see if changing the Tranny fluid and rear end (differential) fluids is something you might want to tackle yourself.
After doing these things,just keep a little notebook as to when and what milage you did these items to your car.
Good luck!

