I have a 2000 monte 3.4L with 135,xxx miles on it. Ive got it apart for a head gasket. The injectors look kinda dirty. Like grimy and such.
Is there a correct way to clean them?
I've heard of spraying SeaFoam in the brake vacuum hose, and fuel tank additives.
Then there is this...
Is this actually ok? any other suggstions?
I just want to cover all bases while my engine is in a million pieces lol

Thanks!!