Get a diagnostic check done first. Even a generic OBD-II reader will give you tell tale MAF sensor and O2 sensor readings.
Mine did what you're describing and turned out to be a single O2 sensor (after a local set-up managed to get nearly $3k out of me trying and replacing everything BUT the O2 sensors!! Even had the CATS changed!)
Was nothing to do with leads or plugs.
Just my 2c worth....


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