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Q: White Smoke...after new injectors? on 2003 Chevrolet Silverado 2500 HD

I just purchased the truck. The gentlemen informed me he had just replaced the injectors last year, all 8 of them. Then while driving it the other day i noticed a little white smoke when I took off. I asked around, one of my buddies said i could have something in my air intake causing a little white smoke? is that possible or are the injectors going out again?
I figured I would add some better fuel treatment? and get a oil change plus buy a new air filter..
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"Bad" fuel injector and excess fuel causes black smoke, gray blue smoke on acceleration or after prolonged idle is oil related ( engine mechanical issues). White smoke could be steam, if you are loosing coolant could be as sign of a blown head gasket.
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