Whoa. Too much emotion and confusion.
First things first.
CEL and "no malfunction" is *meaningless*. The latter is for specific MB stuff, like oil volume or a lamp or brake warning, etc. The CEL relates to OBD codes. ALL CARS have OBD...most don't have the self-check MB system.
Thus, thinking that there aren't problems because the console says no malfunction is complete folly.
Second, unplugging the maf is usually a waste of time. When you unplug it and then start the engine, the ECU sets pretty much everything to defaults. So say you had a marginal O2 sensor, when it goes to default things smooth out. If you replace the maf because it smoothed out you just flushed your money. And in your case it didn't change, so you didn't learn anything anyway.
However, you now have stored maf codes, and you don't know if they're from before or from your test.
The place to start, then, is to check codes. Even now, if the only codes you have are for the maf. If you have the crank sensor code, then absolutely change it, but 90+% of the time these engines won't throw a code for a bad crank sensor. So the lack of that code doesn't mean the sensor is good.
If you really want to eliminate the maf, you need to scan the thing and get some live data from it.
As to the crank sensor, it's in the back of the engine. If you want to find it, check the diy I posted in the 210 forum, it's in the same location on your engine.
The one on the front is the cam sensor, it rarely -- if ever -- causes a problem.
As to your issue, there are a few possibilities. Dirty fuel filter, failing fuel pump, maf, crank sensor, O2 sensor, clogging cats...etc.
So if codes don't help you out, you either make an educated guess, pay for diagnostics, or just start replacing things.
If I owned your car, based solely on what you have described, I would change the crank sensor. It is a known weak link and is in the realm of probability for your symptoms. It's also inexpensive and not the worst diy. You could spend 4-6 times the cost of the crank sensor on diagnostics.
So I hope that helps; at least there's some things to think about.