Cold start stumbling, corrects in about 20 seconds

Happy to see all runs good!

I run on iridium. I believe the dr8eix on top of my head. In fact I swap the conventional plug on a all my cars that I buy to Iridium (If possible). They make a better combustion, thus you will run more economical and the lifetime is 2x longer. They cost also twice as much. I also notice some more responsive nice with some cars, but not with the Mondial. I do notice a better combustion.

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No problems with fine wire iridiums here. Have used them on a few cars. What I see as fairly common is novices damaging the fine wire tip upon re-gapping. They blame ramp type gappers, when in fact it is the improper use of ramp or coin type gappers that can damage the center electrode. If you use a ramp style gapper, do not pry against the ramp to open the gap. Use the included feature for that, which will be a small hole in the tool the ground straps inserts into to leverage it away from the plug to open the gap. You probably know this already, but it is worth mentioning in the interest of saving a more costly spark plug from damage. Used properly the gapper tool need not apply any load to the fine wire tip, nor ever touch it during the actual setting of the gap, and only a light touch is required while checking the gap along the ramp.

(I should have spoke up at the beginning. I was going to suggest plug gap as a possible cause.)