Do not take injectors apart unless you no longer want to use them..
it is more likely an injector is clogged than dead,, the chance of having good injectors is high they are long lived
disconnect one injector !!you can connect an injector one at a time to see if they all shoot the same ,, install some sort of plate beneath injector ..or place inside can to prevent sprayed fuel from causing singhed eyebrows(gearhead favorite)
if you are going to have these checked you should do the cleaning and checked,, more expensive but will prevent future problem .. I would do single test one at a time as long as you are confident you will not start bonfire for marshmellows..
Goggle to linder tech .com & witch hunter performance for info on how to check your injector with omn meter ..give sites a quick look over and decide which one suits you best or check both out ,, in the past year there is a lot of info available on these sites for the average owner and they are easy to read..
keep injectors in a plasic bag with some form of disicant or rice,, rust is a killer of injectors..KEEP THEM DRY..oil outside
replace injector o rings every 10 years or sooner they harden and hurt performance,, this part is still available from GM cheap
[This message has been edited by uhlanstan (edited 12-10-2008).]