Rolling Idle

[Dominus]

So now my poor 92 SVX has developed a bad habit of not maintaining a steady idle. It seems okay while it is cool, but once it warms up (which seems to take a while) the idle at stops is very erratic. It dips and revs like it isn't getting air or fuel or something and seems like it is about to stall. It hasn't stalled yet, but the problem seems to be getting worse so it might soon.

I recently replaced the MAF to fix a stalling problem and that seems fixed. When it had the bad MAF it would stall out at lights and corners or when I wasn't giveing it gas, which it doesn't do now. I also replaced the fuel filter thinking it could be the problem. That didn't help at all. I checked all the air hoses going into and out of the snorkus and they all seem tight (except for one on the back which will only go up about half way, but it is above the lip and there doesn't seem to be a leak so I doubt that is the problem). I also recently cleaned the throttle body. There are no check engine lights. The cars has 200,000 miles.

Any ideas what could be causing this?

PS: Also there seems to be significantly less power while the car is driving. More gas has to be applied to reach speed and the acceleration is way off. I have been beaten off the line by buses. it also seem louder.