starts runs rough and dies. I can keep it running but runs real rough.

[Keister7]

I have two 1992 SVX’s
One is great but the other one started with this. Driving on the freeway it would caugh and the check engine light would come on. Would run a little rough and when off the freeway at a stop light would die. Started easy but would run rough and have to keep rpm up to keep it running. If I stop it might die. Ready to travel in a few minutes it would start and run great. It got worse. Now it starts cold, check engine light stays on, and rpm goes to about 1200. (Normal), but runs a few seconds and rpm goes slowly down to ZERO. Now the check engine light will never go off if the ignition switch is on, Runs rough all the time and will always die without my help at low (idle) rpm . I have taken it to 3 different Subaru dealers, and I am sure you all know the result! They put the analyzer on it and still have no clue. I don’t want to play their guessing game! Any suggestions? Thanks. Keister7..keith@ourlifeline.net
starts runs rough and dies. I can keep it running but runs real rough.