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I'm having this weird problem. During neutral, if I was to accelerate to 2000-3000rpms at 20-30 percent throttle, my o2 volts would kick up to about 1 - 1.02 volts! My knock sensor was replaced about 5k miles ago too and my Low fuel trims are 110.

Also, if the ECU caps are bad, how can they actually cause knock? And how can I tell if they are bad?
 

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I would blame it on the Walbro and the lack of an AFPR.

I have the Walbro 255 also and have noticed that my O2's will be pegged at about .97v or so at about 50% throttle.
 
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