Agreed, vacuum leak somewhere. The system is picking up a lean fault, too much air. Probably not an exhaust leak, likely PCV or a rubber vaccuum line. If its not affecting idle, the problem is likely very minor.
Check for exhaust and vacuum leaks, mass air flow sensor, oxygen sensor, spark plugs, any one of those could be the problem
Look for a vacuum leak around the pvc or an exhaust leak, if all seems ok check the o2 sensors
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