1997 Subaru Impreza Hesitations

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Jan 3, 2003
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Dublin, OH
My 97 Impreza 2.2L auto feels weak with some hesitation around 2000-3000rpms with approximately half throttle applied. Doesn't hesitate with very light or heavy throttle (e.g. during tranny kickdowns). Occassionally the idle will hunt between 500-800rpms.

No CELs but could the MAF or some engine sensor becoming defective produce poor performance but not throw a CEL?
 
the maf can go, but it will eventually throw a cel. mine seemed to wait a while before the code showed up. i reset the ecu and it came back, but it took a while again.

then i got it fixed...
 
I was reading stuff up and came across a case of plugged cat converter, could that cause the loss of power at low rpms and also intermittent hesitations?
 
Not sure if this will help, but does the problem happen both when cold and at operating temp? (Thinking: does it happen both when ECU is in open loop and closed loop A/F ratio control?)
-Louis
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