Thanks all, for the help.
Yeah, the CEL is on. Of course.
I found the MAF sensor by looking one up to buy it, so I could see what it looked like--it was easier to find. I had read something about cleaning them, so I sprayed it off with a hose.
Just kidding. I tried to blow it out with some canned air, and I also, tapped the connector and some dirt came off. I put it back to together. At first I thought it was better, but it's still basically the same.
But I wonder why does one cost 22 bucks and one cost 250? Hmmm.
These are the symptoms--and when I read this it seems obvious it needs plugs/wires:
when it is cold, it runs rough. Lack of power on the take off. Occasionally it will jerk a little, like a misfire. After it warms up, it runs fine until I give it some gas. At a light, after it is warmed up, it sits there running rough--so I shut it off. I turn it back on, and it's smooth, like it "reset" or something. If I baby it, it runs okay, but any mild acceleration causes it to hesitate and then its back to that. Shutting it off and restarting it resets it. I don't want to keep doing that, obviously.
If I give it gas it hesitates, but if I get on it a little, it gets past that hesitation and runs. No problem.
It seems obvious now that its the plugs. Do I change the wires and coil packs as well? If I go into an MB shop, what are they going to try to sell me for that?
I realize that I didn't get the codes tested yet. I'm not sure what i was thinking, but I wanted to make sure I could get at these very simple parts first. I'm going to run the codes, and I'll let you know what it says.
Thanks.