Probably going to have it taken to a shop but thought I’d ask about an 'issue' here first.

When brick is cold at first start, idling to “get warm” an occasional small “miss” or “bump” happens . After warmed up that goes away. Is there something that operates at a “cold start” that could be an issue? I will say new Bosch spark plugs were put in as was the cap, rotor, and wires, also new, a couple months ago at same time. This “issue” started about 2 weeks ago. Kind of annoying. . I did check for loose wires, vacuum leaks, etc,; all seems good. Just cant figure out why it does this only at a cold start.

Thank you for your inputs.