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Hello, my name is*****'d assuming your asking if a oxygen sensor problem could cause a lack of power? I figured I'd double check because I'm not sure what you mean by "line system"? Thanks.
It sounds like you may have a clogged catalytic converter. First unplug electrical connections on front oxygen sensor. If that helps you know the oxygen sensor needs to be replaced. If not, remove the oxygen sensor completely from exhaust to see if it runs better, if so the catalytic converter is clogged. Let me know if you have more questions, thanks.