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thats what i figured. do you have a scan tool that can view live data or freeze frame? you would want the car at operating temp in closed loop and record long term fuel trim, it should be above 23%. then check the o2's, they should be between 200-800mV. check for vacuum, emissions, air intake, and exhaust leaks in front of the o2's.
maybe you should figure out what the rattling noise is first, then get into the nitty gritty.
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