I have a 2009 tahoe ltz that has been making a popping noise when driving straight down the street, I already changed out the strut and it's still making the noise. any suggestions? ?

 

Sway bar links like to use a ball and socket, and when that wears it can pop in/out.

or check your CV shafts if it's a 4WD.

 

I know this a blanket answer and not a real DIY but if you have not had an alignment done, it might be worth the $80-$100 to have one done, it will also give them the opportunity to inspect the linkage/suspension for any wear or damage.... I have had luck with asking if I can do my own under vehicle inspection while they have it up on the rack to do their work...