Repost - slight popping sound in engine

[ClearwaterBMW]

Repost since my other thread has a redirect issue.

1990 325i, starts great, runs great, acceleration is still head snapping. But, after it warms up and at speed or idle I get a slight popping sound from engine. Almost like the pop you get out of those fancy mufflers that some folks do, but well...muffled and coming from engine. Thoughts?

[Northern]

I think anyone has a clue without a video/audio clip.

[Zambuzan]

Knock? ....lol
Misfire? Or maybe loud injectors?
Post sound!

[ClearwaterBMW]

IsI swapped out plugs, rotor, and distributer. Seems to have helped. One I figure out how to post a video, will share it.