Is it worth cleaning the barn-door style AFM?
Can you use something like throttle body cleaner?
I got all prepped to clean the MAF sensor based on the forum advice, and have now had it pointed out that my old girl doesn't have such a thing.......

 

Good how-to on AFM cleaning, function and testing can be found at Clark's Garage. It is a 944 site, but it is useful for your needs. http://www.clarks-garage.com/shop-manual/elect-22.htm

AFM Cleaning and Repair
Sometimes erratic operation of the AFM can be caused by dirty contacts, dirty conducting strip, or due to grooves worn in the AFM potentiometer conducting strip. This section covers cleaning the AFM and changing the position of the AFM wiper to correct erratic operation.
With the AFM cover removed (see preceding sections), clean the AFM potentiometer conducting strip using a pencil eraser. Work carefully and don't be to aggressive when using the eraser.
Clean the contacts on the bottom of the wiper arm (see picture below) using emery cloth or fine grit sandpaper (400 grit). The best way to do this is to disassemble the AFM enough to remove the wiper arm. If you don't feel comfortable disassembling the AFM, you can clean the wiper arm in place. However, you need to insert a sheet of paper between the wiper arm and the conducting strip first. Then clean the contacts by inserting the sandpaper or emery cloth between the paper and the contacts on the bottom side of the wiper arm. The paper serves to protect the conducting strip while cleaning the wiper arm contacts.

Now that you've cleaned the AFM, it's a good idea to test it again to see if the cleaning has corrected the problem with erratic operation. If it does not correct the problem, and it's obvious that there are deep grooves in the potentiometer conducting strip, adjust the wiper arm position as described in the following step.
Place a piece of paper between the wiper arm and the potentiometer conducting strip. Change the position of the wiper arm by pushing down on both sides of the back part of the wiper arm (see arrows in picture below) to bend the arm slightly. This effectively shortens the arm such that the contacts on the bottom side of the arm will ride on a different (ungrooved) part of the conducting strip.

Test the AFM as described in previous sections to determine if erratic operation is corrected. If not, the AFM should be replaced.

 

cool, thanks fot the link. I don't have erratic operation, but it feels a bit..... gutless. Of course, this being the first time I've ever been in one perhaps my expectations are off on the power aspect. Seems to me like it has a banana in the tailpipe.....
Ipulled the cat, to find it has been gutted by a po, so that"s not it. the o2 was in rough shape so I replaced that. I will be putting on a new Borla cat-back exhaust to replace the banged up Ansa(?) on there and I figured to check out the AFM, but I'm nervous about messing with something that miht not be broke......

 

I would start a new thread. You would get great help on your rough running issues.

Have you checked the condition of your green distributor wire?

 

As far as your AFM, if you decide crack it open, it will be very apparent if either your wiper arm strip is either dirty/oxidized or has grooves warn it like an old LP. If so, you can clean and re track per the above instructions.

If you are thinking about messing with the barn door calibration, I would not consider doing that without (at least) a wideband O2 setup, or more likely on a smog dyno.

 

Banana in the tailpipe. ..