I have a 1973 450sl that ran perfectly until I decided to do some preventative maintenance. *facepalm
Thursday night, I was looking it over and noticed that my ignition rotoscoped was a bit worn. Nothing bad, just maybe a few years old. I installed the new Bosch one that I had ordered. With the new rotor, it ran fine under acceleration, but at traffic lights, it would stumble a bit and sometimes stall, always starting right back up.
Friday morning, I figured I'd go ahead and put the rest of the new parts on. Plug wires (Bosch), distributor cap (Beru), and points. Since this, I have the misfire from hell, and backfiring while driving. The original cap had part of a write that broke off in it while I was removing, so I cannot just swap back to what I had on there.
My question--I suspect the cap to be the culprit. The wires were put on identically to how they were on the old cap. I'm sure the order and locations are correct. Have other people had issues with Beru caps? The fit doesn't feel as tight as the Bosch cap that came off of it. I can move it around a bit with it clipped in place.

What are your thoughts?