Just wanted to know how much it would cost for a tune up on a 04 grandprix gtp?

replace the faulty solenoid and see if that fixes it

As long as you install both struts it should work.

Well yes and no, anything is possible with enough work and or money. You can install it on another vehicle but without proper tuning you will do damage to the engine ... that being said there are several ways to sort this out. Custom tuning and bigger injectors and a fuel controller with a boost sensor input would be good or if you can swap wiring and computers that would work as well but is a bit of an undertaking. And really it comes down to how much boost you plan on running if the supercharger has the stock pulley you might be able to just get away with a tune hope that helps .... ps apex fuel controllers are pretty cheap and fairly easy to install. Pss. Some will tell you to do a boost referenced fuel pressure regulator and bump fuel pressure up to compensate... In my experience I have found this approach doesn't work well at all and is pretty unreliable

Pull the error code and see what they say..

No it is not.

malfunction with the indicator lamp.

Hope this helps:

Below is the diagram you requested. Best of luck and thank you for using Fixya!
Greg

2004 Pontiac Gran Prix 3.8L

Check your IAC valve and MAF sensor...clean both of them.

It should be located directly behind the crank shaft pulley.. There also may be a second one on back bottom side of engine between engine and firewall..