So I took my brothers truck in with the injector issue...link below

http://www.dieselplace.com/forum/showthread.php?t=368288

I was told the injector harness is not covered under the warranty until the injector fails. He also said that the fuel pressure regulator is stuck wide open allowing an uncontrolled amount of fuel to the motor(not regulating) and that it is impossible for me to change out because it's under the intake plenum...plus the $1000 price tag didn't fit with me too well....and the knocking and pinging is the result of the FPR being stuck wide open. Now when the codes are cleared and don't come back the truck runs fine with no knocking or pinging...The service guy also said that they recommend a fuel injector flush....He said the #3 injector is on the verge of going out and that's why he's recommending the injector flush to determine if it is going out...What do you guys think...

How much to individual injectors cost??

$270 gmparts direct.com but the get you with the shipping

GM covered my harness under warranty (of course that was 4 years ago).
Wish I had known about the shipping from gmpartsdirect. ordered a $13 part and paid $15 shipping! There was no screen that gave me the total amount before my card was charged. That will be the last part I order from them.

the best price i found on injectors was at thompson diesel were in okc $350. each plus $100. core here thier phone . (405)943-8535 factory bosh remans one year warranty

BG makes a good flush but it can't correct the regulator, if you took it to a dealer I would try a different one about warranty, ask if anyone inyour area knows a dealer that knows there stuff about warantys

How hard it is to change the injector harness myself??