My duramax seems to be making a louder than what i think is normal rattle at higher RPMs, mainly noticable on the highway. Maybe im just being over critical, but the noise seems louder than what i remember hearing. The noise is hard to explain, but it seems to be louder than i remember. Also, I can notice a trace of smoke when the engine is idling (i really have to stare at it for a while to see it). Is this normal?

What are some signs of an injector out of wack? I'm going to try to have the dealer read off the injector balance rates. Would an injector with a higher balance rate (whatever the balance rate is) cause more noise at high RPM and a slight smoke at idle?

I get alot of Chatter at the 2000 rpm range.... 65+ mph.... Especially towing..

Smoke at Idle could require the Re-flash at the dealer, mien quit when i got ti done...