Off Topic Question, Cut out on VW Jetta Options

[partwerks]

Within the first 4 minutes of a cold engine, my 96 VW Jetta, has this thing where it will intermittently cut out. If you happen to be stopped, one of two things, if you let it run it's course, then the idle will fluctuate up and down from about 700 to 900 for about 5 seconds, or there abouts, and then the idle goes high to about 1200, for about 5 seconds, and comes down to normal idle.

On the other hand, if you slam the pedal down, and let back up quck, it tends to clear it out, and everything is normal. Otherwise, it runs just fine once it has it's fit.

I've cleaned all the grounds that I know of, and replaced the coolant temp sensor, and throttle body, but not sure what is causing it??

I'm hoping someone might have an idea on what is causing it.

It would almost make me think that it is something that when it first warms up?

Any, thoughts, ideas, or suggestions?

[partwerks]

Took it to the mechanic:

Ck codes17535, fuel trim bank 1, system too rich P1127, 16486 Mass air flow sensor signal too low PO102, found intake air hose off of throttle body, cleaned MAF sensor.

Only thing that didn't make sense, is if it is the hose that hooks to that brass fitting on the TB, as I recall, it was on there the first time I opened the hood to try and see what the whole ordeal was about. It doesn't pull off easy, and was a hose clamp holding it on. Unless he was talking about some other hose, and/or was a bit loose or something, but probably would have noticed that when I opened the hood the first time, if it was off, but runs good now...........

I don't see any other hose on the TB?