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#4: 01-03-2013, 08:53 PM
Title: Contributor
Location: Galena, IL
Car: 1999 Legacy "L" 5MT 271k
Posts: 591
iTrader: (1)
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Do you have main bearing noise or piston slap?? Sometimes that can set the knock sensor off and derate the engine. the 2000-3000 is a famous place for this to occour.

Apparently there is a way to calibrate your TPS. If the hesistation is consistent, your throttle position sensor could have a dead spot.