1999 Subaru Forester

Engine Performance problem
1999 Subaru Forester 4 cyl All Wheel Drive Manual 235K miles

The check engine light is always on. It used to be intermittent. The horsepower seems to drop intermittently to the point where I have trouble accelerating. Then it's fine. I purchased a code reader but can't find the computer plug under the dash. Can anyone help me find this connector or tell me what could be wrong with my car?
May 6, 2008.

Check out the related content below while we wait for the question to be answered by a professional mechanic.