O ring was in place. Everything was Bosch brand except for Champion plugs (though I highly doubt the brand would have anything to do with this), all fuel components from the fuel pumps to the fuel injectors are new (less than 1 month old). Plugs look brand new, they are only slightly brown and have zero carbon or any other type of build up. Could a faulty ignition coil or ezl cause this? I replaced the cap yesterday as well as my alternator (again, not throwing parts, just replacing because I have these on hand and get them replaced free), but I'm worried that there may be another issue causing it and don't want to fry this one. I do have an extra ezl and ignition coil on hand too, but as I've said the car runs incredibly smooth with no hiccups in idle and I'm not sure if a hard start issue would be failing symptoms of the coil or ezl. I think I read somewhere that when those components fail then it is total failure and the car won't even start or run. I could be wrong though.

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1990 190E 3.0L