So I posted about a truck im interested in earlier with a video of the below mentioned sound that i found as we were talking when I taped the gass peddle very quickly and it made a internal rattle the gmc dealer tried to say its a normal sound I knew better .it wasnt every time and it was only right when you pushed the gass quickly from a idle position. I took it a independent machanic and he agrees it was Not normal and related to the known valve issue possibly at least. the gmc dealer then took it inside and agreed it was not normal . Upon checking it will be repaired under the powertrain warranty . Long story short. They can't get it in to be fixed til next week and Won't hold it for me till the repair is complete. So it is what I wanted and have looked for some time to find it but am unsure if I should buy it before the issue is repaired ? they say it is perfectly fine to drive until the repair can be performed. Any advice . Should I buy it now before or hope its still there after repairs? Thank you very much for any input.