Both my 92 SVX's have had funny idle, near or actual stall problems with one doing it intermittently and the other finally not starting at all after a stall. Both my problems were fixed with a good MAF swap. I tried the resolder fix on one and didn't help in my case 100% albeit made the stall problem pretty infrequent in comparision to before. Some suggest cleaning...mine were always already clean from regular upkeep with MAF spray cleaner so didn't help. With over 3,000 posts you seen this discussed.
No CEL if MAF the only problem. Get a known good MAF and swap her in...I have yet to not see this fix the problem. In my case, one SVX had the MAF fail at 60K and again at 92K, the other one failed at 90K.
I'm sure some listers here have a decent used one..that's where I got my last one. eBay of course has them but probably a bit more iffy as to quality. A new one can be found on RockAuto for less than the Dealers but still pricey.
http://www.ebay.com/itm/SUBARU-92-97...8e48ea&vxp=mtr
http://www.ebay.com/itm/92-97-Subaru...fff6f7&vxp=mtr