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Does it seem like engine is being limited such as not able to go above 2000-3000 rpm?
This usually is a symptom of a clogged catalytic converter. Completely remove front oxygen sensor to relieve exhaust pressure, if that allows rpm to go higher you know the converter is clogged and needs to be replaced. Let me know how it goes or if you have more questions, thanks.
No problem, you can reply to this answer at any time without additional fees so just let me know how it goes when you get a chance. Thanks.