L3BOWSKI

I believe my vacuum is okay as I did the test where you remove the oil cap to see if the engine sound changes, and mine nearly died when i removed the cap. Sorry, I should have stated mine is a 1976 280z so I don't believe it has the EGR coupler issues. I will look into the timing and research how to adjust valve lash. Thank you for the replies.

My Z has been occasionally making a "popping" sound when accelerating, or going uphill. sometimes there are a few in rapid succession and sometimes its just one. This is not my video but this is the exact sound that I am hearing. I have all new injectors. I just want to know where to start before i start buying new parts hoping something will fix it. All the vacuum lines are good. I have been googling as much as I can to try to find a solution. Thank you for your time.