Sounds like you will find a code that says Misfire cyl 4. Or it could be any cyl. Most of the time it is worn out spark plugs. that's the easy fix. If it does the same thing after new plugs then you may have burnt valves which is not an unusual problem with Subaru and quite expensive to fix. From $1500 to $2200 depending where you go for repairs.
SOURCE: 1997 subaru outback legacy overheating
I've had the same problem all year. I've had four different mechanics look at this car - 97 legacy with 2.5. I've had the coolant seals replaced, the radiator cap, the thermostat, the water pump - all to no avail. I've realized now that it only overheats shortly after running sustained high rpm's. Recently the last mechanic mentioned the bleeder valve (I didn't know it had one and think maybe he didn't know either - not a subaru mechanic). Recently it overheated again (again sustained high rpm's - apparently more prone to produce air in the system), I sat the vehicle on an incline (raising the bleeder valve to be the highest point) and let the car warm up and run for half an hour. Now 300 miles and no overheat. I went through alot with this car to get to this point. Unbelievable.
SOURCE: i have a subaru legacy outback, abs light comes on
one of your abs sensor is bad or the abs motor,go to local shop to diagnose which sensor,shop usually charge $ 60 to diagnose abs system,good luck, let me know ..
SOURCE: Check engine light on. P0325, P0420 2000 Subaru
CODE PO420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD BANK I * CODE PO325 KNOCK SENSOR NO.1 CIRCUIT MALFUNCTION BANK NO.1 OR SINGLE SENSOR
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