Oil filler cap creamy not overheating dipstick and water levels fine just started running of cylinder had been odd puffs of smoke

If the car is used mostly for short trips, a creamy oil cap is not unusual. Try to use this car for the occasional long trip to dry it out. The concern is that the oily sludge will fill up the tube that runs from the front corner of the valve cover down to the crankcase ventillation valve under the intake manifold. If that hose plugs up (typically only happens if the sludge freezes) the system can start sucking oil up through the oil drain from the crankcase ventilation valve and pumping it into the intake manifold. This problem is rare, usually seen only in 6 cyl BMW SUVs that are used for running errands in mountain communities and never really warm up, but it can happen if you have a lot of water/oil sludge buildup.
The rest of your problem statement is not completely clear. Missing a cylinder when cold is very common and may be caused by any one of several problems. If it smooths out after a minute or two, it is not a big concern. If the car misses on a cylinder after it is warm, check the age of your spark plugs, they should be replaced every 50k miles or so. Try pouring some fuel injector cleaner (Techron is the most popular) through it. A weak coil is also a possibility Early e46s had some coil problems, but I would expect that if you were going to have coil problems, they would have flared up long before now unless this is a really low mileage car..
The reference to odd puffs of smoke is a little unusual, but it is what reminded me of the possible problem with sludge plugging up the crankcase vent line. I suggest that you pull that line off the front of the valve cover and look inside. If it is full of sludge, get that system cleaned out.