Lately my 99 2.2 has been breathing at idle. Sits at about 700 RPM and goes up and down to 1000RPM at idle. I think it could be an O2 sensor or my MAF but I'm not sure. Any suggestions on what it might be?

 

It goes up to 1k then about a second later it goes to 700k then a second later it goes back up. Like if you were rocking your foot back and forth on the accellerator. I checked for loose stuff a few times already. Sometimes it won't do it, but it usuially does. I'm in North Dakota so I wonder it it might just be the weather. Also, my stock car alarm is acting funny, I think it might be from condensation on cold nights to warm days. Anyone heard anything like that before? Thanks!

 

Before I got too crazy with this I'd try cleaning up or adding new ground connections. Also, look for vacuum leaks.