My kid's 09 Altima 2.4 has 106K miles onit .He told me it gets sluggish going up hills on the highway. He pulled over and saw that the air filter box had a air gap around the filter. Put duct tape around it and now it runs good. Makes no sense to me. Going down to change spark plugs in a couple of days. Does anyone have an idea why it would lose power on the hills? Any help greatly appreciated.
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