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Hi, I have a 98 outback that recently started to hesitate and surge on accel and will just

start pinging up hills on the highway. I have changed , wires, fuel filter, ing coil, spark plugs, used cylinder cleaner, injector cleaner. Both o2 senors & back cat. checked PCV & EGR valve and all Vac lines!

Could this be the knock sensor and where would that be?

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