JSCliff

My 1990 Turbo Loyale wagon is giving me trouble... During warmup it idles at around 1500rpm, but once it is warmed up the idle drops to about 200rpm or even dies. I just replaced the cap and rotor and plug wires a couple weeks ago. I had the alternator checked and its good, it has a brand new battery. This is my first subaru and I've only had it for about a month, so I'm not super familiar with all the mechanics of it yet. Can anybody point me in the right direction? Thanks! jordan